1 |
Leaves 3-veined from base |
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2 Hoya pottsii |
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Leaves pinnately veined, or veins obscure. |
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(2) |
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2 (1) |
Inflorescences 4- or 5-flowered, terminal; leaves 1-1.5 cm |
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32 Hoya chinghungensis |
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Inflorescences many flowered, usually extra-axillary, rarely terminal (H. lii); leaves more than 2 cm. |
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(3) |
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3 (2) |
Outer angle of corona lobes rounded. |
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(4) |
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Outer angle of corona lobes acute. |
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(13) |
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4 (3) |
Leaves villous or pubescent. |
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(5) |
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Leaves glabrous. |
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(6) |
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5 (4) |
Leaf blade broadly oblong or long quadrate, villous, apex mucronate; corolla lobes as long as tube |
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23 Hoya villosa |
+ |
Leaf blade elliptic, oblong, elliptic-lanceolate, or rarely suborbicular, pubescent, apex short acuminate to obtuse; corolla lobes longer than tube |
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24 Hoya lyi |
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6 (4) |
Leaf blade orbicular to widest above middle, 3-6 cm wide. |
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(7) |
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Leaf blade of other shapes, if more than 3 cm wide then widest below middle. |
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(9) |
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7 (6) |
Leaf blade spatulate to oblanceolate, 10-21 cm, lateral veins 10 or more pairs; flower clusters flat topped; corolla white with purple spots |
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21 Hoya radicalis |
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Leaf blade obovate to orbicular, 4-8 cm, lateral veins ca. 4 pairs or obscure; flower clusters globose; corolla uniformly white. |
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(8) |
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8 (7) |
Apex of leaf blade retuse or concave, lateral veins obscure |
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20 Hoya kerrii |
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Apex of leaf blade entire, lateral veins conspicuous, ca. 4 pairs |
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22 Hoya liangii |
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9 (6) |
Leaf blades often pandurate, sometimes oblong; peduncle 0.3 cm; corolla yellow or reddish |
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27 Hoya pandurata |
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Leaf blade lanceolate or oblong-lanceolate to oblong-oblanceolate; peduncle 1-8 cm; corolla white. |
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(10) |
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10 (9) |
Branchlets and petiole hairy; peduncle 1-4 cm; corolla reflexed; corona lobes erect. |
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(11) |
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Branchlets and petiole glabrous; peduncle 5-8 cm; corolla rotate; corona lobes spreading-stellate. |
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(12) |
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11 (10) |
Branchlets and petiole setose; lateral veins of leaf blade conspicuous adaxially; inflorescences terminal |
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25 Hoya lii |
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Branchlets and petiole minutely puberulent at least when young; lateral veins of leaf blade ill defined adaxially; inflorescences extra-axillary |
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26 Hoya mekongensis |
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12 (10) |
Leaf blade 1.5-2 cm wide; flower clusters flat topped; corolla 1-1.5 cm in diam., villous inside |
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28 Hoya mengtzeensis |
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Leaf blade 2.5-4.5 cm wide; flower clusters globose; corolla ca. 3 cm in diam., obscurely puberulent inside |
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29 Hoya griffithii |
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13 (3) |
Corolla purple; inflorescences on hanging leafless branches (leaves not known) |
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11 Hoya commutata |
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Corolla white, pink, yellow, or yellowish; inflorescences always on normal leafy branches. |
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(14) |
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14 (13) |
Leaf blade linear, 0.4-0.7 cm wide. |
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(15) |
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Leaf blade not linear, 1-6.5 cm wide. |
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(16) |
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15 (14) |
Leaf blade 2.5-5 cm, hirsute abaxially; inflorescences terminal; corolla lobes glabrous |
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31 Hoya linearis |
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Leaf blade 10-20 cm, glabrous; inflorescences extra-axillary; corolla lobes pubescent |
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30 Hoya longifolia |
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16 (14) |
Corolla strongly reflexed; corona distinctly stalked, lobes spurred at base |
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1 Hoya multiflora |
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Corolla not reflexed; corona sessile, lobes not spurred. |
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(17) |
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17 (16) |
Leaf apex caudate; flowers yellow or yellowish. |
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(18) |
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Leaf apex obtuse to acuminate; flowers white or reddish. |
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(20) |
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18 (17) |
Leaf blade 4.5-7 cm, base rounded, lateral veins 4 or 5 pairs, obscure; peduncle ca. 0.4 cm; pedicel 1-1.2 cm; corolla lobes glabrous |
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5 Hoya lasiogynostegia |
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Leaf blade 9-13 cm, base cuneate, lateral veins 10-12 pairs, conspicuous; peduncle 1.5-2.5 cm; pedicel 2-2.5 cm; corolla lobes puberulent inside. |
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(19) |
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19 (18) |
Leaf blade symmetrical at base, lateral veins at right angle to midvein, uniformly colored |
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3 Hoya fusca |
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Leaf blade oblique at base, lateral veins obliquely ascending, midrib with pale zone on both sides |
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4 Hoya lipoensis |
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20 (17) |
Lateral veins of leaf blade obscure or obsolete. |
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(21) |
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Lateral veins of leaf blade conspicuous. |
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(26) |
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21 (20) |
Leaf blade oblong or widest above middle. |
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(22) |
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Leaf blade widest below middle. |
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(23) |
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22 (21) |
Petiole and abaxial surface of leaf blade pubescent; corolla ca. 1.2 cm in diam. |
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6 Hoya thomsonii |
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Petiole and leaf blade glabrous; corolla 2-4 cm in diam. |
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30 Hoya longifolia |
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23 (21) |
Pedicel longer than peduncle. |
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(24) |
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Pedicel shorter than or as long as peduncle. |
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(25) |
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24 (23) |
Leaf blade lanceolate to ovate-lanceolate, apex acuminate; peduncle 1-5 cm; sepals puberulent outside |
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7 Hoya siamica |
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Leaf blade elliptic or elliptic-oblong, apex obtuse; peduncle ca. 0.3 cm; sepals glabrous outside |
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8 Hoya revolubilis |
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25 (23) |
Corolla 0.6-0.7 cm wide, violet dotted, base conspicuously white villous inside, lobes much longer than tube |
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9 Hoya lacunosa |
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Corolla 1.5-2 cm wide, not violet dotted, densely papillate inside, lobes as long as tube |
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10 Hoya carnosa |
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26 (20) |
Flower clusters flat topped. |
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(27) |
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Flower clusters globose. |
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(28) |
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27 (26) |
Leaf blade cordate at base; petiole and abaxial side of midvein puberulent; peduncle shorter than pedicel; calyx outside and corolla puberulent |
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12 Hoya cordata |
+ |
Leaf blade rounded at base; petiole and midvein glabrous; peduncle much longer than pedicel; calyx and corolla glabrous |
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13 Hoya nervosa |
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28 (26) |
Petiole up to 0.4 cm. |
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(29) |
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Petiole 1-3 cm. |
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(30) |
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29 (28) |
Lateral leaf veins numerous, parallel; peduncle shorter than pedicel; corolla lobes papillate inside |
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14 Hoya polyneura |
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Lateral leaf veins 4 or 5 pairs, not parallel; peduncle longer than pedicel; corolla mealy inside |
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15 Hoya dasyantha |
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30 (28) |
Leaves pubescent abaxially, especially along veins. |
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(31) |
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Leaves glabrous. |
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(32) |
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31 (30) |
Leaf blade short acuminate at apex, cuneate at base; calyx glabrous; corolla ca. 1 cm in diam. |
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16 Hoya silvatica |
+ |
Leaf blade obtuse or rounded at apex, rounded or broadly cuneate at base; calyx puberulent outside; corolla ca. 1.5 cm in diam. |
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17 Hoya salweenica |
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32 (30) |
Lateral leaf veins ca. 7 pairs; peduncle to 5 cm; calyx pubescent outside; corolla densely pale scurfy inside |
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18 Hoya fungii |
+ |
Lateral leaf veins ca. 4 pairs; peduncle ca. 2 cm; calyx glabrous; corolla sparsely pubescent inside |
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19 Hoya ovalifolia |