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FOC | Family List | FOC Vol. 13 | Melastomataceae

9. Blastus Loureiro, Fl. Cochinch. 2: 517, 526. 1790.

柏拉木属 bai la mu shu

Shrubs. Branches terete, usually glandular pubescent. Leaves opposite, petiolate to almost sessile; leaf blade oblong-lanceolate to ovate-lanceolate, secondary veins 1 or 2(or 3) on each side of midvein. Inflorescences axillary and umbellate cymes or umbellate or terminal and cymose panicles; peduncle usually short, rarely long or absent; bracts absent or caducous. Flowers (3 or)4(or 5)-merous, minute. Hypanthium funnelform to funnelform-campanulate, (3 or)4(or 5)-sided. Petals 4, ovate, oblong, or rarely lanceolate. Stamens 4(or 5), whorls equal in shape and length; anthers apically attenuate, curved or geniculate, divergent at base, dehiscence poricidal; connective slightly inflated, not appendaged at base. Ovary inferior, 4-celled; placentation axile, paired. Style filiform, simple. Capsule obscurely 4-furrowed, opening at apex by 4 pores, finally loculicidally dehiscing into 4-valves. Seeds very numerous, cuneate.

Twelve species: Cambodia, China, E India, Indonesia, Japan (Ryukyu Islands), Laos, Myanmar, Thailand, Vietnam; nine species (seven endemic) in China.

The genus was revised by Hansen (Bull. Mus. Natl. Hist. Nat., B, Adansonia 1: 43-77. 1982). Further study is necessary to be confident of the status of Blastus tenuifolius and B. tsaii.

1 Leaves sessile; leaf blade fiddle-shaped-elliptic, base auriculate.   1 B. auriculatus
+ Leaves ± petiolate; leaf blade ovate to elliptic, base not auriculate   (2)
2 (1) Inflorescences terminal   (3)
+ Inflorescences axillary, subtended by a leaf or inserted at leaf scars   (4)
3 (2) Anthers ca. 4 mm; hypanthium in flower ca. 5 mm.   2 B. brevissimus
+ Anthers (4.8-)6.2-7.4(-8) mm; hypanthium in flower 3.8-6(-8) mm.   6 B. pauciflorus
4 (2) Hypanthium densely lepidote with a dense cover of peltate glands.   4 B. cochinchinensis
+ Hypanthium not lepidote, with only a few peltate glands   (5)
5 (4) Hypanthium with long patent trichomes in addition to a few peltate glands.   5 B. mollissimus
+ Hypanthium lacking patent trichomes   (6)
6 (5) Leaf blade adaxially minutely puberulous and sparsely strigose.   7 B. setulosus
+ Leaf blade adaxially glabrous or sparsely puberulous when young but then glabrescent   (7)
7 (6) Petals ca. 3 mm; anthers (0.9-)1.4-2.8 mm.   3 B. borneensis
+ Petals 4-5 mm; anthers 3.5-4 mm   (8)
8 (7) Leaf blade oblong to narrowly ovate-oblong, 4-7.5 cm wide.   8 B. tenuifolius
+ Leaf blade lanceolate to rarely elliptic, 2.5-4.2 cm wide.   9 B. tsaii

Lower Taxa


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