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| 1 |
Young branches, inflorescences, and fruits with appressed membranous peltate scales |
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(2) |
| + |
Young branches stellate-hairy, stellate-scaled, or subglabrous |
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(5) |
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| 2 (1) |
Leaf blade leathery; capsule ovoid-ellipsoid or oblong, 2.5-3.5 cm. |
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1 C. joufra |
| + |
Leaf blade papery or thinly papery; capsule subglobose, 0.4-1 cm |
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(3) |
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| 3 (2) |
Leaf margins serrate, both surfaces olivaceous when dry, abaxially sparsely scaly. |
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2 C. mangelong |
| + |
Leaf margins entire, glaucous-gray to gray-brown when dry, abaxially densely scaly |
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(4) |
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| 4 (3) |
Leaf blade 3-veined from base, adaxially sparsely hairy; styles bifid. |
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3 C. kongensis |
| + |
Leaf blade pinnately veined, adaxially glabrous; styles 4-8-fid. |
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4 C. cascarilloides |
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| 5 (1) |
Leaf blade palmately 3-5(-7)-veined |
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(6) |
| + |
Leaf blade pinnately veined |
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(15) |
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| 6 (5) |
Leaf blade palmately (3-)5(-7)-veined |
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(7) |
| + |
Leaf blade palmately 3(-5)-veined |
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(9) |
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| 7 (6) |
Leaf blade papery, abaxially glabrescent, glands at apex of petioles stalked. |
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5 C. euryphyllus |
| + |
Leaf blade thinly leathery, abaxially persistently densely stellate-hairy, glands sessile or stalked |
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(8) |
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| 8 (7) |
Leaf blade rotund to broadly ovate, glabrescent adaxially, basal glands sessile; fruits sparsely stellate-pubescent. |
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6 C. yunnanensis |
| + |
Leaf blade ovate, rarely ovate-elliptic, sparsely stellate-pubescent adaxially, glands at apex of petioles stalked; fruits with densely waxy-yellow scurfy hairs. |
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7 C. yanhuii |
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| 9 (6) |
Bract margins with linear-lanceolate teeth, apex of teeth with capitulate glands; styles 4-lobed. |
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8 C. crassifolius |
| + |
Bract margins entire; styles 2-lobed |
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(10) |
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| 10 (9) |
Glands of leaf base or petiole apex cupular, stalked |
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(11) |
| + |
Glands of leaf base or petiole apex discoid, sessile |
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(13) |
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| 11 (10) |
Young branches, leaves, and inflorescences with purple-brown or purplish waxy stellate pubescence, older leaves glabrous. |
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9 C. purpurascens |
| + |
Young branches, leaves, and inflorescences with yellow-gray stellate hairs, older leaves persistently so |
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(12) |
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| 12 (11) |
Leaf margins denticulate, leaf blade petiolar glands short and broad. |
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10 C. lachnocarpus |
| + |
Leaf margins double-serrate, leaf blade basal glands longer and slender. |
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11 C. cnidophyllus |
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| 13 (10) |
Shrubs scandent; young branches and older leaves hispid; petiole to 1.5 cm, apex with glands; fruits globose. |
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12 C. caudatus |
| + |
Shrubs or treelets; young branches sparsely stellate-hairy, older leaves glabrous; petiole 2.5-10(-14) cm; fruits ellipsoidal |
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(14) |
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| 14 (13) |
Leaves papery, 2-7 cm wide, glands on base; male sepals glabrous at apex. |
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13 C. tiglium |
| + |
Leaves thinly leathery, 7-14 cm wide; glands on petiole apex; male sepals woolly. |
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14 C. damayeshu |
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| 15 (5) |
Ovary and fruits glabrous; leaf blade papery, basal glands sessile and cupular. |
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15 C. chunianus |
| + |
Ovary and fruits with stellate hairs or stellate scale-hairs; leaf blade basal glands sessile or cupular |
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(16) |
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| 16 (15) |
Leaf blade base or petiole apex with sessile, flat, or cupular glands |
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(17) |
| + |
Leaf blade base or petiole apex with stalked and cupular glands |
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(20) |
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| 17 (16) |
Inflorescences glabrous; female petals filamentous or absent |
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(18) |
| + |
Inflorescences hairy; female petals present, oblong |
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(19) |
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| 18 (17) |
Leaves thinly leathery, abaxially with scurfy stellate hairs; petioles with cupular glands at apex. |
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20 C. laniflorus |
| + |
Leaves papery, glabrous on both surfaces, base with flat glands. |
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21 C. dinghuensis |
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| 19 (17) |
Young branches and inflorescences with densely scurfy stellate scale-hairs; leaves glaucous-gray, base with semiorbicular glands. |
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22 C. laevigatus |
| + |
Young branches and inflorescences densely stellate-pubescent; leaves yellow-brown when dry, base with cupular glands. |
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23 C. laui |
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| 20 (16) |
Leaf blade not olivaceous-green when dry, abaxially glabrous or tomentose |
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(21) |
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Leaf blade olivaceous-green when dry, abaxially glabrous |
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(22) |
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| 21 (20) |
Young branches and inflorescences with stellate scale-hairs; leaves papery, oblong-lanceolate, glabrous on both surfaces; petiole short, less than 1 cm. |
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18 C. hancei |
| + |
Young branches and inflorescences stellate-tomentose; leaves thickly papery, long elliptic to oblong-elliptic, tomentose abaxially; petiole 1-6 cm. |
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19 C. merrillianus |
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| 22 (20) |
Young branches sparsely stellate-hairy; leaves smaller, 3-7 cm, margin entire, base with glands; petiole less than 1 cm. |
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16 C. howii |
| + |
Young branches with appressed stellate hairs; leaves 7-14 cm, margin denticulate; petiole more than 1 cm, with glands at apex |
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(23) |
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| 23 (22) |
Leaf blade base cuneate, equilateral. |
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17 C. lauioides |
| + |
Leaf blade base rounded or unequally cordate. ..... C. moonii (see note above) |
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