| 1 |
Nutlets semiglobose-tetrahedral. |
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(2) |
| + |
Nutlets trigonous-tetrahedral, inverted to oblique, subulate. |
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(14) |
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| 2 (1) |
Nutlet tuberculate, adaxially crustaceously obtuse ribbed. |
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(3) |
| + |
Nutlet smooth, glabrous, shiny, neither tuberculate nor ribbed. |
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(7) |
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| 3 (2) |
Corolla white; bracts present on lowermost 1 or 2 flowers of inflorescences |
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12 Trigonotis nandanensis |
| + |
Corolla blue to purple; bracts absent. |
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(4) |
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| 4 (3) |
Inflorescences sessile |
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11 Trigonotis macrophylla |
| + |
Inflorescences conspicuously pedunculate. |
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(5) |
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| 5 (4) |
Peduncle 1-4 cm; leaf blade lanceolate, densely strigose |
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8 Trigonotis compressa |
| + |
Peduncle to 1 cm; leaf blade broadly ovate to elliptic or orbicular, sparsely strigose. |
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(6) |
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| 6 (5) |
Leaf blade ovate to broadly elliptic, apex obtuse to emarginate; calyx lobes oblanceolate; corolla 3.5-4 mm wide |
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9 Trigonotis mairei |
| + |
Leaf blade orbicular to broadly elliptic, apex retuse, mucronate; calyx lobes narrowly ovate; corolla 5-6 mm wide |
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10 Trigonotis orbicularifolia |
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| 7 (2) |
Corolla appressed puberulent; leaf blade to 6 cm; lateral veins prominent adaxially |
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13 Trigonotis heliotropifolia |
| + |
Corolla glabrous; leaf blade less than 5 cm; lateral veins not prominent. |
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(8) |
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| 8 (7) |
Inflorescences bracteate throughout; pedicel twisted or recurved |
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1 Trigonotis delicatula |
| + |
Inflorescences ebracteate or only lower half or lowermost 2 or 3 flowers bracteate; pedicel usually ascending. |
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(9) |
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| 9 (8) |
Plants gray-white villous. |
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(10) |
| + |
Plants hispid. |
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(11) |
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| 10 (9) |
Leaf blade broadly ovate to rotund; corolla limb ca. 2.5 mm wide; calyx lobes obtuse at apex; stipe of nutlet straight |
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6 Trigonotis mollis |
| + |
Leaf blade narrowly elliptic; corolla limb 5-6 mm wide; calyx lobes acuminate at apex; stipe of nutlet curved |
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7 Trigonotis vestita |
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| 11 (9) |
Corolla limb ca. 7 mm wide; leaf blade orbicular to reniform; nutlet ± sessile |
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2 Trigonotis rotundata |
| + |
Corolla limb 4-6 mm wide; leaf blade oblong to elliptic; stipe of nutlet 0.2-0.3 mm. |
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(12) |
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| 12 (11) |
Stems densely gray hispid; leaves sessile; corolla 5-6 mm wide |
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5 Trigonotis barkamensis |
| + |
Stems sparsely hispid or minutely strigose; leaves petiolate; corolla 3.5-4 mm wide. |
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(13) |
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| 13 (12) |
Stems much branched at base, strigose; stem leaves oblong; inflorescences with leaflike bracts to middle; angle at inner surface of nutlet indistinct |
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3 Trigonotis corispermoides |
| + |
Stems unbranched or with 1 lateral branch, minutely strigose; stem leaves narrowly ovate to elliptic; inflorescences with 1 or 2 basal bracts only; angle at inner surface of nutlet obtuse |
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4 Trigonotis chengkouensis |
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| 14 (1) |
Nutlets with adaxial 3 surfaces subequal in size, sessile, attachment scar basal, abaxial surfaces triangular; inflorescences ebracteate. |
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(15) |
| + |
Nutlets with adaxial bottom surfaces and abaxial ones usually arcuate-convex, adaxial bottom surface smaller, 2 lateral surfaces equal in size; inflorescences bracteate at least basally. |
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(24) |
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| 15 (14) |
Leaf blade broadly ovate to broadly elliptic. |
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(16) |
| + |
Leaf blade lanceolate to oblong. |
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(18) |
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| 16 (15) |
Stems with sterile branches to 75 cm; leaf blade elliptic to rotund; pedicel ca. as long as calyx |
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16 Trigonotis omeiensis |
| + |
Stems without sterile branches; leaf blade broadly ovate to broadly lanceolate; pedicel 1-2 × as long as calyx. |
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(17) |
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| 17 (16) |
Calyx lobes broadly ovate, obtuse, ca. 2 mm; inflorescences dichotomously branched |
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14 Trigonotis cavaleriei |
| + |
Calyx lobes oblanceolate, acute, 2-3 mm; inflorescences with cymes 2- or 3-fascicled |
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39 Trigonotis funingensis |
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| 18 (15) |
Corolla white. |
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(19) |
| + |
Corolla blue. |
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(20) |
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| 19 (18) |
Corolla 5-6 mm wide; calyx lobes lanceolate, apex acute; pedicel 3-7 mm |
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19 Trigonotis nankotaizanensis |
| + |
Corolla 4-5 mm wide; calyx lobes obovate-spatulate, apex obtuse; pedicel 1-3 mm |
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18 Trigonotis elevatovenosa |
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| 20 (18) |
Corolla deep blue |
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15 Trigonotis leyeensis |
| + |
Corolla light blue. |
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(21) |
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| 21 (20) |
Plants with runners |
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17 Trigonotis formosana |
| + |
Plants without runners. |
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(22) |
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| 22 (21) |
Leaf blade lanceolate, apex acuminate; middle and upper stem leaves ± sessile; pedicel 5-6 mm; nutlets abaxially slightly convex, acutely 3-ribbed |
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20 Trigonotis giraldii |
| + |
Leaf blade elliptic to elliptic-ovate, apex obtuse to acute; middle and upper stem leaves short petiolate; pedicel 2-4 mm; nutlets abaxially flattened or slightly concave, narrowly ribbed or winged. |
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(23) |
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| 23 (22) |
Nutlet cluster fastigiate, acute; corolla (2-)4-5 mm wide |
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22 Trigonotis laxa |
| + |
Nutlet cluster cross-shaped; corolla 2-2.5 mm wide |
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21 Trigonotis floribunda |
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| 24 (14) |
Inflorescences bracteate. |
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(25) |
| + |
Inflorescences bracteate only at base. |
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(26) |
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| 25 (24) |
Stems single, erect to spreading, without runners; nutlets glabrous, ca. 1 mm |
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23 Trigonotis bracteata |
| + |
Stems usually cespitose, erect becoming creeping; nutlets pubescent, ca. 2 mm |
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24 Trigonotis radicans |
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| 26 (24) |
Plants annual or biennial; corolla white or light blue. |
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(27) |
| + |
Plants perennial, rarely ?biennial; corolla blue or purple. |
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(28) |
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| 27 (26) |
Corolla white or light blue, ca. 3 mm wide; carpophore of nutlet curved |
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37 Trigonotis tibetica |
| + |
Corolla white, ca. 4 mm wide; carpophore absent |
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38 Trigonotis leucantha |
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| 28 (26) |
Junction of calyx tube with pedicel distinctly thickened, clavate in fruit |
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36 Trigonotis peduncularis |
| + |
Junction of calyx tube and pedicel not clavate. |
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(29) |
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| 29 (28) |
Corolla 7-8 mm wide |
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35 Trigonotis rockii |
| + |
Corolla not exceeding 6 mm wide. |
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(30) |
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| 30 (29) |
Nutlet ca. 2 mm, without carpophore; corolla ca. 6 mm wide |
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25 Trigonotis myosotidea |
| + |
Nutlet 1-1.3 mm, with or without carpophore; corolla 3-5 mm wide. |
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(31) |
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| 31 (30) |
Plants cespitose, ca. 20 cm. |
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(32) |
| + |
Plants not cespitose, 20-60 cm. |
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(34) |
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| 32 (31) |
Corolla 1.7-2.2 mm wide |
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28 Trigonotis harrysmithii |
| + |
Corolla ca. 3 mm wide. |
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(33) |
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| 33 (32) |
Leaf blade cordate to orbicular-ovate, apex acute; calyx lobes lanceolate; stipes of nutlets ± straight to ± curved |
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26 Trigonotis tenera |
| + |
Leaf blade oblong to rotund, apex rounded, mucronate; calyx lobes ovate; stipes of nutlets distinctly curved, short |
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27 Trigonotis petiolaris |
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| 34 (31) |
Stems gray strigose; leaves subleathery |
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34 Trigonotis cinereifolia |
| + |
Stems green strigose; leaves herbaceous. |
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(35) |
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| 35 (34) |
Corolla purple; fruiting pedicel 0.9-1.6 cm; stems branched from base upward |
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29 Trigonotis longipes |
| + |
Corolla bluish; fruiting pedicel to 1 cm, if longer then stems simple or branched near base only. |
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(36) |
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| 36 (35) |
Fruiting pedicel to 2 cm |
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30 Trigonotis gracilipes |
| + |
Fruiting pedicel to 0.8 cm. |
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(37) |
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| 37 (36) |
Nutlets ca. 1.2 mm; lateral leaf veins indistinct |
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31 Trigonotis muliensis |
| + |
Nutlets ca. 1 mm; lateral leaf veins distinct at least adaxially. |
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(38) |
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| 38 (37) |
Lateral leaf veins 3 pairs, prominent, strigose abaxially; branches short |
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32 Trigonotis microcarpa |
| + |
Lateral leaf veins 2 pairs, visible abaxially, scarcely prominent, pubescent; branches elongated |
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33 Trigonotis longiramosa |
