| 1 |
Flowers 5-merous |
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(2) |
| + |
Calyx lobes 4 |
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(13) |
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| 2 (1) |
Inflorescences always axillary; calyx white; hypogynal disk annular. |
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1 D. axillaris |
| + |
Inflorescences mostly terminal, often on lateral branches, sometimes also axillary; calyx mostly yellow or golden-yellow; hypogynal disk lateral to ovary |
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(3) |
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| 3 (2) |
Upper whorl of stamens inserted at or below middle of calyx tube |
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(4) |
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Upper whorl of stamens inserted at or close to mouth of calyx tube |
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(6) |
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| 4 (3) |
Primary branches strigose; leaf blade 1-1.8 × 0.2-0.4 cm; calyx tube exterior glabrous. |
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2 D. rosmarinifolia |
| + |
Primary branches finely pubescent; leaf blade 2.5-8 × 0.6-2.2 cm; calyx tube exterior sericeous |
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(5) |
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| 5 (4) |
Calyx tube 10-14 mm, slender, obliquely ascending; inflorescences shortly spicate, ebracteate. |
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3 D. gemmata |
| + |
Calyx tube 8-9 mm, broad, erect; inflorescences capitate or fascicled, bracteate, bracts leaflike, caducous. |
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4 D. gracilis |
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| 6 (3) |
Calyx tube exterior glabrous |
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(7) |
| + |
Calyx tube exterior hairy |
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(9) |
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| 7 (6) |
Leaf blade linear to linear-oblong, lateral veins obscure. |
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7 D. angustiloba |
| + |
Leaf blade ovate to obovate or oblong-lanceolate to broadly elliptic, lateral veins visible |
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(8) |
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| 8 (7) |
Inflorescence few- to several flowered, peduncle 1-3 cm; young stems glabrous. |
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5 D. esquirolii |
| + |
Inflorescence 2- or 3-flowered, peduncle shorter than 0.3 cm; young stems densely appressed hirsute. |
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11 D. penicillata |
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| 9 (6) |
Calyx tube 9-12 mm |
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(10) |
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Calyx tube 4-7 mm |
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(11) |
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| 10 (9) |
Branches short, rather stout; plant deciduous. |
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8 D. modesta |
| + |
Branches long, slender; plant evergreen. |
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12 D. tenuiflora |
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| 11 (9) |
Leaf blade 5-9.5 × 1.5-3 cm; pedicel 0.5-1 mm. |
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6 D. pedunculata |
| + |
Leaf blade 0.8-3 × 0.15-1.6 cm; pedicel absent |
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(12) |
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| 12 (11) |
Leaf blade linear or linear-oblanceolate, 8-10 × 1.5-2.5 mm; calyx tube 4-5 mm, lobes ca. 2 mm. |
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9 D. holosericea |
| + |
Leaf blade obovate or broadly elliptic, 10-30 × 5-16 mm; calyx tube 6-7 mm, lobes 4-5 mm. |
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10 D. myrtilloides |
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| 13 (1) |
Calyx exterior glabrous (rarely with few scattered hairs), often caducous after anthesis |
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(14) |
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Calyx tube exterior hairy |
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(26) |
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| 14 (13) |
Leaves at least partly truly opposite; calyx deep yellow to orange; ovary glabrous. |
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13 D. aurantiaca |
| + |
Leaves alternate, rarely subopposite; calyx usually white or pink to purplish red, rarely yellow or greenish yellow |
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(15) |
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| 15 (14) |
Calyx lobes 0.2-2.5 mm; tube 3-6 mm, often urceolate (Taiwan) |
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(16) |
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Calyx lobes 2.5-12 mm; tube (5-)6-16 mm, cylindric (mainland China) |
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(19) |
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| 16 (15) |
Leaf blade apically obtuse or obtuse-apiculate |
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(17) |
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Leaf blade apically emarginate or retuse |
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(18) |
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| 17 (16) |
Leaf blade 15-20 mm wide; petiole 3-9 mm; calyx tube campanulate. |
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16 D. arisanensis |
| + |
Leaf blade 3-4 mm wide; petiole ± absent; calyx tube urceolate. |
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17 D. morrisonensis |
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| 18 (16) |
Plants ca. 0.2 m tall; stems brown; calyx tube urceolate; leaf blade 7-10(-14) mm wide |
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18 D. nana |
| + |
Plants to 2 m tall; stems yellowish green; calyx tube cylindric; leaf blade 10-15 mm wide. |
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19 D. chingshuishaniana |
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| 19 (15) |
Calyx yellow, yellow-green, or green; inflorescence ebracteate |
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(20) |
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Calyx white or pink to purplish red; inflorescence bracteate |
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(21) |
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| 20 (19) |
Petiole very short to absent; inflorescences terminal on long, slender branches; calyx yellow. |
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20 D. giraldii |
| + |
Petiole 3-10 mm; inflorescences terminal on very short lateral branchlets, superficially apparently axillary; calyx yellowish green. |
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21 D. pseudomezereum |
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| 21 (19) |
Calyx tube 5-8 mm, shorter than or equal to lobes |
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(22) |
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Calyx tube (6-)9-13 mm, usually longer than lobes (ca. as long in D. odora) |
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(23) |
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| 22 (21) |
Bracts 1.5-3 cm; leaf blade 6-10 × 2.5-3.2 cm. |
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22 D. grueningiana |
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Bracts 0.5-0.8 cm; leaf blade 1.4-4(-7) × 0.6-1.4 cm. |
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23 D. retusa |
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| 23 (21) |
Branchlets glabrous; calyx lobes 6-12 mm, ca. as long as tube, base auriculate. |
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24 D. odora |
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Branchlets pubescent at least when young; calyx lobes 5-8(-10) mm, clearly shorter than tube, base not auriculate |
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(24) |
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| 24 (23) |
Branchlets turning purplish red to purplish brown; calyx white, lobes acute or acuminate. |
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25 D. acutiloba |
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Branchlets turning yellowish brown or brownish gray to gray; calyx white or pale pink, exterior flushed purplish, lobes obtuse, rarely acuminate |
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(25) |
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| 25 (24) |
Hypogynal disk shallowly cup-shaped, margin entire; ovary apically gray pubescent, stigma squamate. |
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26 D. limprichtii |
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Hypogynal disk annular, margin fringed; ovary glabrous, stigma not squamate |
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27 D. tangutica |
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| 26 (13) |
Calyx bluish purple, lilac, or lavender, lobes 4-7(-10) mm, almost as long as tube; inflorescences mostly produced before leaves, sessile on very short lateral branches, less often pedunculate, terminal on long shoots and/or axillary. |
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14 D. genkwa |
| + |
Calyx white, green, yellow, pink, or if purplish, then with lobes shorter than tube; inflorescences produced after leaves, terminal on normal stems or truly axillary |
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(27) |
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| 27 (26) |
Leaves mostly opposite or subopposite, sometimes also alternate. |
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15 D. jinzhaiensis |
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Leaves mostly alternate, rarely also subopposite, very rarely a few opposite |
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(28) |
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| 28 (27) |
Inflorescences axillary |
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(29) |
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Inflorescences terminal, sometimes also axillary, sometimes on short lateral branches |
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(30) |
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| 29 (28) |
Calyx white; leaf blade 1.5-4.5 × 0.6-1.8 cm; fruit apically rounded or subacute. |
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28 D. championii |
| + |
Calyx purple-red; leaf blade 5-11 × 2-3 cm; fruit apically acuminate-apiculate. |
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29 D. rhynchocarpa |
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| 30 (28) |
Calyx lobes 12-13 mm; calyx white with yellow center; creeping shrublet to 30 cm. |
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39 D. macrantha |
| + |
Calyx lobes 2.5-9(-11) mm; calyx not white or if white without yellow center; shrub 50-200 cm or taller |
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(31) |
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| 31 (30) |
Leaf blade abaxially persistently hairy, sometimes only at apex |
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(32) |
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Leaf blade abaxially glabrous except sometimes when extremely immature |
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(35) |
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| 32 (31) |
Calyx yellow, tube 8-15 mm; hypogynal disk square, lateral. |
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31 D. erosiloba |
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Calyx green, reddish, or purplish red, tube 3-8 mm; hypogynal disk cupular or annular, symmetric |
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(33) |
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| 33 (32) |
Leaf blade linear or linear-oblanceolate, 1.5-2.5 mm wide; calyx green, tube 3-6 mm. |
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32 D. wangiana |
| + |
Leaf blade elliptic, oblong, oblong-lanceolate, or obovate-elliptic, 3-25 mm wide; calyx reddish or purplish red with paler purple-pink or white lobes |
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(34) |
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| 34 (33) |
Calyx lobes 2.5-3 mm, much shorter than tube; leaf blade membranous, rarely thinly papery. |
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23 D. retusa |
| + |
Calyx lobes 6-9 mm, ca. as long as or longer than tube; leaf blade leathery. |
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30 D. leishanensis |
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| 35 (31) |
Inflorescences without involucral bracts |
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(36) |
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Inflorescences with involucral bracts |
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(40) |
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| 36 (35) |
Calyx purplish red, tube ca. 4 mm. |
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33 D. purpurascens |
| + |
Calyx white or cream, 8-12 mm |
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(37) |
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| 37 (36) |
Leaf blade 5-13 × 1.6-3.5(-5) cm, apex long acuminate; calyx tube ca. 15 mm. |
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38 D. sureil |
| + |
Leaf blade 1.5-6(-9) × 0.6-1.5(-2) cm, apex obtuse or acute, rarely apiculate or retuse; calyx tube 8-12(-14) mm |
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(38) |
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| 38 (37) |
Peduncle very short to absent; plant deciduous; calyx tube 10-12 mm; lobes 6-8 × 4-5 mm, obtuse, apiculate. |
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34 D. altaica |
| + |
Peduncle 3-10 mm; plant evergreen; calyx tube 8-10(-14) mm; lobes 2-2.5(-3.5) mm wide, acuminate |
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(39) |
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| 39 (38) |
Leaf blade papery; peduncle 8-10 mm; drupe 8-12 mm. |
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35 D. longilobata |
| + |
Leaf blade leathery; peduncle ca. 3 mm; drupe ca. 5 mm. |
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36 D. depauperata |
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| 40 (35) |
Hypogynal disk lobed or laciniate |
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(41) |
| + |
Hypogynal disk entire, sometimes very narrow, or margin undulate or undulate-serrate |
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(44) |
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| 41 (40) |
Petiole 4-12 mm; inflorescences terminal and axillary |
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(42) |
| + |
Petiole 0.5-2 mm; inflorescences strictly terminal |
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(43) |
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| 42 (41) |
Calyx lobes 5-7 mm; leaf blade lateral veins 8-12 pairs; disk 2-lobed, each lobe 2-fid at apex. |
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40 D. yunnanensis |
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Calyx lobes 3-4 mm; leaf blade lateral veins 12-16 pairs; disk cup-shaped, irregularly laciniate. |
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41 D. laciniata |
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| 43 (41) |
Leaf blade 2-5 × 0.8-1.5 cm, lateral veins 5 or 6 pairs; calyx tube 10-11 mm. |
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42 D. tripartita |
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Leaf blade 5-15 × 2-4 cm, lateral veins 6-10 pairs; calyx tube 6-8 mm. |
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43 D. jinyunensis |
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| 44 (40) |
Calyx at least partly purplish red or pink |
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(45) |
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Calyx white or creamy-white |
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(48) |
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| 45 (44) |
Involucral bracts 14-18 mm; calyx lobes 5-7 mm. |
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48 D. bholua |
| + |
Involucral bracts 4-7 mm; calyx lobes 3-5 mm |
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(46) |
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| 46 (45) |
Pedicel 3-4 mm; calyx lobes 2-colored, adaxially white, abaxially 2 purple or dark maroon. |
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52 D. taylorii |
| + |
Pedicel 1-2.5 mm; calyx lobes uniformly colored |
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(47) |
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| 47 (46) |
Branches hispid; pedicel ca. 2.5 mm; calyx overall ca. 14 mm; fruit ca. 6 mm. |
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49 D. xichouensis |
| + |
Branches sparsely tomentose; pedicel 1-1.4 mm; calyx overall 10-11 mm; fruit ca. 4 mm. |
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50 D. emeiensis |
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| 48 (44) |
Calyx tube urceolate, 3-5 mm; leaf blade 0.8-1.6 cm wide, apex obtuse or rounded, usually slightly retuse. |
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37 D. brevituba |
| + |
Calyx tube cylindric, (5-)8-15(-18) mm; leaf blade (0.7-)1.4-3.5 cm, apex often acute |
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(49) |
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| 49 (48) |
Young branches tomentose |
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(50) |
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Young branches sparsely hairy to glabrous |
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(51) |
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| 50 (49) |
Peduncle ca. 2 mm; flowers not fragrant; anthers 1-2 mm. |
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44 D. papyracea |
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Peduncle 3-6 mm; flowers fragrant; anthers ca. 3 mm. |
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46 D. longituba |
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| 51 (49) |
Branches initially angular, grayish yellow, later turning purplish brown or bright purple, sometimes sparsely hairy. |
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45 D. feddei |
| + |
Branches not angular, dark gray, dark purplish red or purplish brown, or brown, usually glabrous |
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(52) |
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| 52 (51) |
Margins of leaf blade and bracts ciliate with a tuft of hairs at apex. |
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51 D. pachyphylla |
| + |
Margins of leaf blade and bracts not ciliate and without apical tufts |
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(53) |
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| 53 (52) |
Bracts sparsely hairy; inflorescence 3-10(-12)-flowered. |
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44 D. papyracea |
| + |
Bracts glabrous; inflorescence usually 9-12-flowered. |
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47 D. kiusiana var. atrocaulis |
