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14. Clerodendrum Linnaeus, Sp. Pl. 2: 637. 1753.

大青属 da qing shu

Shrubs or small trees, rarely subshrubs or herbs, erect or rarely climbing, deciduous or evergreen. Branchlets usually 4-angled when young. Leaves simple, opposite or rarely whorled. Inflorescences loosely cymose or capitate, in terminal or rarely axillary paniculate thyrses. Calyx campanulate or cup-shaped, ca. 5-dentate or deeply 5-lobed. Corolla with a slender tube; lobes 5, spreading. Stamens 4, ± exserted. Ovary 4-locular; ovules pendulous or laterally attached. Style with 2 acute stigmatic lobes. Fruiting calyx ± inflated. Fruit a drupe with 4 1-seeded pyrenes, sometimes separating into 2 2-loculed or 4 1-locular mericarps.

About 400 species: mostly tropical and subtropical, few in temperate Asia, Africa, and America; 34 species in China.


1 Corolla tube 5 cm or longer; leaves in whorls of 3-5   1 Clerodendrum indicum
+ Corolla tube less than 5 cm; leaves opposite, rarely in whorls of 3.   (2)
       
2 (1) Calyx truncate or subtruncate at anthesis.   (3)
+ Calyx 5-lobed or 5-dentate at anthesis.   (4)
       
3 (2) Subshrubs 0.3-0.5 m tall; leaf blade membranous; calyx ca. 2 mm; corolla tube ca. 5 mm, lobes ca. 5 mm   33 Clerodendrum subscaposum
+ Shrubs 1-4 m tall; leaf blade papery; calyx ca. 5 mm; corolla tube ca. 7 mm, lobes 6-12 mm   34 Clerodendrum serratum
       
4 (2) Inflorescences 3-10-flowered.   (5)
+ Inflorescences more than 10-flowered.   (7)
       
5 (4) Corolla tube equal or slightly longer than calyx; calyx lobes triangular-ovate to broadly ovate   10 Clerodendrum fortunatum
+ Corolla tube much longer than calyx; calyx lobes triangular-lanceolate.   (6)
       
6 (5) Leaf blade papery; inflorescences terminal; calyx deeply lobed, lobes ca. 1 cm, triangular-lanceolate   31 Clerodendrum griffithianum
+ Leaf blade thick papery; inflorescences axillary or rarely subterminal; calyx dentate or subtruncate in fruit   32 Clerodendrum inerme
       
7 (4) Leaf blade abaxially with numerous peltate glands usually covered with a sand-colored secretion.   (8)
+ Leaf blade abaxially with few or no peltate glands.   (10)
       
8 (7) Leaf blade shallowly palmately 3-5-lobed   4 Clerodendrum paniculatum
+ Leaf blade not lobed.   (9)
       
9 (8) Stamens ca. 2 cm   2 Clerodendrum intermedium
+ Stamens 4.5-7.5 cm   3 Clerodendrum japonicum
       
10 (7) Leaf blade 2-3 as long as wide.   (11)
+ Leaf blade less than to 2 as long as wide.   (19)
       
11 (10) Inflorescences capitate or flat-topped cymes with a short axis.   (12)
+ Inflorescences thyrsoid with an elongated axis.   (15)
       
12 (11) Leaf blade densely yellow glandular on both surfaces   11 Clerodendrum luteopunctatum
+ Leaf blade without glands or glands only on 1 surface.   (13)
       
13 (12) Inflorescences capitate, ca. 5.5 cm; calyx lobes lanceolate, reflexed at anthesis   12 Clerodendrum ervatamioides
+ Inflorescences flat-topped, 7-16 cm; calyx lobes triangular-lanceolate, erect at anthesis.   (14)
       
14 (13) Leaf blade papery; corolla tube ca. 1 cm; calyx 3-4 mm   13 Clerodendrum cyrtophyllum
+ Leaf blade membranous; corolla tube 2-3 cm; calyx 6-7 mm   14 Clerodendrum kwangtungense
       
15 (11) Branchlets 4-angled, winged   5 Clerodendrum wallichii
+ Branchlets terete or slightly 4-angled, not winged.   (16)
       
16 (15) Inflorescences more than 15 cm; leaf blade usually membranous   9 Clerodendrum longilimbum
+ Inflorescences less than 15 cm; leaf blade usually papery.   (17)
       
17 (16) Leaf pairs with unequal blades and petioles   6 Clerodendrum garrettianum
+ Leaf pairs with equal blades and petioles.   (18)
       
18 (17) Leaves black when dry; inflorescences slightly pendulous, racemosely arranged thyrses; calyx lobes ovate-oblong   7 Clerodendrum henryi
+ Leaves green when dry; inflorescences thyrsoid cymes; calyx lobes triangular- lanceolate   8 Clerodendrum hainanense
       
19 (10) Cymes not crowded.   (20)
+ Cymes crowded.   (26)
       
20 (19) Inflorescences without a distinct axis.   (21)
+ Inflorescences with a distinct axis.   (22)
       
21 (20) Leaf blade adaxially sparsely pubescent to subglabrous, abaxially puberulent; calyx densely pubescent; corolla lobes without glands   24 Clerodendrum colebrookianum
+ Leaf blade adaxially sparsely strigose, abaxially strigose only on veins; calyx puberulent; corolla lobes glandular outside   25 Clerodendrum kaichianum
       
22 (20) Inflorescences rounded   26 Clerodendrum villosum
+ Inflorescences flat topped.   (23)
       
23 (22) Calyx 3-6 mm, teeth awl-shaped or narrowly triangular.   (24)
+ Calyx 11-15 mm, teeth ovate-elliptic or ovate.   (25)
       
24 (23) Leaf blade papery, abaxially densely small glandular; calyx ca. 6 mm, teeth narrowly triangular   27 Clerodendrum kiangsiense
+ Leaf blade subleathery, abaxially without glands; calyx 3-4 mm, teeth awl-shaped   28 Clerodendrum mandarinorum
       
25 (23) Branchlets, petioles, and peduncles densely tomentose and glandular; stamens equal to or slightly longer than corolla tube; style slightly longer than stamens   29 Clerodendrum brachystemon
+ Branchlets, petioles, and peduncles ± pubescent to subglabrous; stamens exserted; style shorter than stamens   30 Clerodendrum trichotomum
       
26 (19) Inflorescences axillary.   (27)
+ Inflorescences terminal.   (28)
       
27 (26) Leaf blade subglabrous; bracts deciduous in fruit   15 Clerodendrum peii
+ Leaf blade densely pubescent; bracts persistent in fruit   16 Clerodendrum bracteatum
       
28 (26) Plants densely villous; calyx longer than fruit, without peltate glands   17 Clerodendrum canescens
+ Plants pilose or tomentose; calyx shorter than fruit, with peltate glands.   (29)
       
29 (28) Calyx and bracts pubescent with densely purplish red jointed glands   18 Clerodendrum tibetanum
+ Calyx and bracts pubescent but not as above.   (30)
       
30 (29) Calyx lobes linear-lanceolate or lanceolate.   (31)
+ Calyx lobes narrowly triangular, triangular, triangular-lanceolate, or ovate- lanceolate.   (32)
       
31 (30) Corolla lobes elliptic to ovate, ca. 10 mm   19 Clerodendrum chinense
+ Corolla lobes obovate, 5-7 mm   20 Clerodendrum lindleyi
       
32 (30) Corolla tube shorter than or equal to calyx; leaf blade adaxially strigose, abaxially densely yellowish brown pubescent especially on veins   21 Clerodendrum yunnanense
+ Corolla tube longer than calyx; leaf blade adaxially sparsely pubescent, abaxially sparsely glandular pubescent, subglabrous, or pubescent on veins.   (33)
       
33 (32) Bractlets lanceolate, ca. 1.8 cm; calyx 2-6 mm, lobes narrowly triangular to triangular, not longer than calyx tube   22 Clerodendrum bungei
+ Bractlets linear, 0.5-0.8 cm; calyx 10-15 mm, lobes triangular-lanceolate, longer than calyx tube   23 Clerodendrum confine

  • List of lower taxa


     

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