| 1 |
Suffrutescent herbs with a woody rhizome; ovary 2-locular |
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46 Premna herbacea |
| + |
Trees or shrubs; ovary 4-locular. |
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(2) |
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| 2 (1) |
Inflorescences spikelike or racemelike thyrses; calyx lips entire or upper lip slightly emarginate. |
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(3) |
| + |
Inflorescences compound cymes; calyx not 2-lipped or if 2-lipped then lips dentate or lobed. |
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(5) |
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| 3 (2) |
Inflorescences racemelike thyrses with pedunculate cymes |
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43 Premna racemosa |
| + |
Inflorescences spikelike thyrses with sessile cymes. |
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(4) |
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| 4 (3) |
Shrubs; leaf blade papery; bracts ca. 10 mm |
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44 Premna interrupta |
| + |
Trees; leaf blade subleathery; bracts ca. 5 mm |
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45 Premna bracteata |
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| 5 (2) |
Calyx 4-dentate or subtruncate, not indistinctly 2-lipped. |
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(6) |
| + |
Calyx 5-dentate, 5-lobed, or distinctly 2-lipped. |
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(10) |
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| 6 (5) |
Leaf blade leathery or thickly papery, both surfaces glabrous. |
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(7) |
| + |
Leaf blade papery or submembranous, pubescent. |
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(8) |
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| 7 (6) |
Erect trees or shrubs; leaf blade thickly papery, veins elevated on both surfaces |
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37 Premna scoriarum |
| + |
Plants climbing; leaf blade leathery, veins abaxially obscure or only slightly distinct |
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38 Premna scandens |
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| 8 (6) |
Branches gray-yellow; leaf blade base rounded or truncate |
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34 Premna fohaiensis |
| + |
Branches brown to black-brown; leaf blade base cuneate to subrounded. |
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(9) |
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| 9 (8) |
Leaf blade broadly ovate to ovate-lanceolate, papery |
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35 Premna szemaoensis |
| + |
Leaf blade narrowly elliptic to elliptic, submembranous |
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36 Premna paisehensis |
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| 10 (5) |
Calyx distinctly 2-lipped. |
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(11) |
| + |
Calyx not 2-lipped, actinomorphic (calyx nearly 2-lipped in P. confinis). |
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(15) |
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| 11 (10) |
Calyx lower lip emarginate, upper lip with 3 minute emergences |
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42 Premna laevigata |
| + |
Calyx lower lip subentire to shortly 3-lobed, upper lip emarginate or 2-dentate. |
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(12) |
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| 12 (11) |
Calyx 4-5 mm. |
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(13) |
| + |
Calyx 1.5-3 mm. |
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(14) |
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| 13 (12) |
Base of leaf blade cuneate to decurrent |
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8 Premna confinis |
| + |
Base of leaf blade rounded to somewhat cordate |
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39 Premna odorata |
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| 14 (12) |
Lower lip of calyx subentire to slightly 2-dentate; corolla yellow or white |
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41 Premna hainanensis |
| + |
Lower lip of calyx subentire to 3-dentate; corolla greenish yellow |
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40 Premna serratifolia |
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| 15 (10) |
Cymes in a lax conical panicle. |
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(16) |
| + |
Cymes in a lax flat-topped corymb or dense capitulum. |
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(24) |
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| 16 (15) |
Branchlets, leaves, and petioles with stellate hairs |
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1 Premna pyramidata |
| + |
Branchlets, leaves, and petioles without stellate hairs. |
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(17) |
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| 17 (16) |
Leaf blade base narrow cuneate or decurrent. |
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(18) |
| + |
Leaf blade base cuneate or subcordate. |
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(20) |
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| 18 (17) |
Evergreen; leaf blade leathery, adaxially dark yellow glandular; calyx nearly 2-lipped |
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8 Premna confinis |
| + |
Deciduous; leaf blade papery, adaxially without glands; calyx equally 5-dentate. |
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(19) |
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| 19 (18) |
Leaf blade margin serrate or entire; corolla ca. 7-9 mm |
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3 Premna microphylla |
| + |
Leaf blade margin entire or 3-5-crenate; corolla 3-5 mm |
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4 Premna ligustroides |
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| 20 (17) |
Inflorescence branches not scorpioid; flowers usually persistent. |
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(21) |
| + |
Inflorescence branches often scorpioid; flowers usually deciduous but pedicel usually persistent. |
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(22) |
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| 21 (20) |
Leaf blade pubescent, without glands or with minute inconspicuous glands; branchlets horizontal |
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2 Premna puberula |
| + |
Leaf blade subglabrous on both surfaces, abaxially brownish red glandular; branches ascending |
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5 Premna sunyiensis |
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| 22 (20) |
Shrubs, usually climbing; panicles 2-5 cm wide |
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9 Premna fordii |
| + |
Shrubs or trees, usually erect; panicles 8-15 cm wide. |
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(23) |
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| 23 (22) |
Leaf blade 9-15 5-9 cm; petiole 2-5 cm; branchlets puberulent when young; panicles always conical |
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6 Premna cavaleriei |
| + |
Leaf blade 5-9 3-4 cm; petiole (0.1-)0.2-0.3 cm; branchlets tomentellous when young; panicles often rounded |
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7 Premna chevalieri |
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| 24 (15) |
Cymes in a lax flat-topped corymb. |
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(25) |
| + |
Cymes in a dense capitulum. |
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(35) |
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| 25 (24) |
Leaf blade densely pubescent or pilose on 1 or both surfaces. |
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(26) |
| + |
Leaf blade adaxially glabrous or subglabrous except for pubescent veins. |
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(30) |
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| 26 (25) |
Flowers dusty yellow |
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14 Premna latifolia |
| + |
Flowers white to greenish or yellowish green. |
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(27) |
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| 27 (26) |
Leaf pairs equal |
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18 Premna tapintzeana |
| + |
Leaf pairs unequal. |
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(28) |
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| 28 (27) |
Leaves, branchlets, and petioles densely villous |
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16 Premna fulva |
| + |
Leaves, branchlets, and petioles pilose. |
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(29) |
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| 29 (28) |
Branchlets with white lenticels; inflorescences 6-17 cm across; stamens didynamous, exserted |
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15 Premna flavescens |
| + |
Branchlets with yellow lenticels; inflorescences less than 6 cm across; stamens subequal, included |
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19 Premna crassa |
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| 30 (25) |
Leaf blade leathery |
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12 Premna maclurei |
| + |
Leaf blade papery or membranous. |
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(31) |
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| 31 (30) |
Leaf blade membranous, abaxially sparsely white or yellow glandular; stamens subequal; ovary apex white glandular |
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17 Premna straminicaulis |
| + |
Leaf blade papery, abaxially without glands; stamens didynamous; ovary glabrous, without glands. |
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(32) |
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| 32 (31) |
Erect shrubs or trees; leaves black when dry. |
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(33) |
| + |
Climbing shrubs; leaves dark green, brownish, or dark brown when dry. |
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(34) |
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| 33 (32) |
Leaf blade 3-4(-5) cm wide; panicles to 25 cm |
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7 Premna chevalieri |
| + |
Leaf blade 5-6 cm wide; panicles 3-7 cm |
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13 Premna octonervia |
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| 34 (32) |
Leaf blade ovate, oblong, or rarely obovate, dark green or brownish when dry; bracts lanceolate |
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11 Premna puerensis |
| + |
Leaf blade broadly ovate to elliptic, dark brown when dry; bracts awl-shaped |
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10 Premna subscandens |
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| 35 (24) |
Leaf blade and calyx red, purple-red, or orange glandular. |
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(36) |
| + |
Leaf blade and calyx yellow glandular. |
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(39) |
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| 36 (35) |
Leaf blade and calyx red or purple-red glandular; calyx lobes less than half the calyx. |
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(37) |
| + |
Leaf blade and calyx orange glandular; calyx lobes more than half the calyx. |
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(38) |
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| 37 (36) |
Leaf blade purple-red glandular on both surfaces; corolla violet to pinkish, 4.5-5 mm |
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20 Premna glandulosa |
| + |
Leaf blade deep red glandular abaxially; corolla nearly orange, ca. 6 mm |
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21 Premna henryana |
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| 38 (36) |
Calyx teeth linear-lanceolate; ovary pilose, apically white glandular; leaf blade 1.5 cm wide |
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22 Premna punicea |
| + |
Calyx teeth narrowly triangular; ovary glabrous, without glands; leaf blade 2-4 cm wide |
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23 Premna rubroglandulosa |
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| 39 (35) |
Corolla white, yellow, to greenish. |
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(40) |
| + |
Corolla pinkish, purple, rose, or rose red. |
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(43) |
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| 40 (39) |
Leaf blade cordate |
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31 Premna velutina |
| + |
Leaf blade ovate-lanceolate, to rounded. |
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(41) |
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| 41 (40) |
Corolla tube glabrous outside; ovary glabrous |
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29 Premna mekongensis |
| + |
Corolla tube pubescent outside; ovary pubescent. |
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(42) |
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| 42 (41) |
Leaf blade broadly ovate to rounded; petiole ca. 3 mm |
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32 Premna tenii |
| + |
Leaf blade ovate to ovate-oblong; petiole 4-10 mm |
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33 Premna subcapitata |
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| 43 (39) |
Leaf blade abaxially densely pubescent |
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30 Premna yunnanensis |
| + |
Leaf blade abaxially sparsely pubescent. |
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(44) |
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| 44 (43) |
Calyx equal to or shorter than fruit; corolla pinkish. |
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(45) |
| + |
Calyx longer than fruit; corolla purple, rose, or rose red. |
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(46) |
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| 45 (44) |
Leaf blade 2-6 cm wide, ovate, base cordate; ovary glabrous; calyx shorter than fruit |
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24 Premna urticifolia |
| + |
Leaf blade 0.3-1.1 cm wide, lanceolate to ovate-lanceolate, base cuneate to rounded; ovary sparsely pubescent; calyx as long as fruit |
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25 Premna parvilimba |
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| 46 (44) |
Ovary sparsely pubescent; calyx teeth linear to linear-lanceolate |
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28 Premna acutata |
| + |
Ovary glabrous; calyx teeth lanceolate or triangular-lanceolate. |
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(47) |
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| 47 (46) |
Leaf blade 1.5-3.5 cm; petiole 4-5 mm; inflorescences 12-flowered |
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26 Premna steppicola |
| + |
Leaf blade (2.5-)5-6 cm; petiole 1-2 mm; inflorescences 2-4(-6)-flowered |
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27 Premna oligantha |
