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FOC | Family List | FOC Vol. 24 | Commelinaceae

10. Pollia Thunberg, Nov. Gen. Pl. 1: 11. 1781.

杜若属 du ruo shu

Aclisia E. Meyer.

Herbs perennial. Rhizomes horizontal, long. Stems erect or ascending, usually simple. Leaves alternate. Panicles terminal; cincinni with several flowers, proximal involucral bracts nearly leaflike, distal ones small; bracts enveloping inflorescence axis, membranous. Flowers actinomorphic. Sepals free, shallowly boat-shaped, often enlarging and persistent in fruit. Petals free, white, blue, purple, or greenish yellow, sometimes spotted, ovate-elliptic, ovate-orbicular, or obovate, sometimes clawed. Stamens 6, all fertile, equal or 3 smaller, or only anterior 3 fertile; filaments glabrous; anther locules oblong, longitudinally dehiscent; antherodes deltoid-lanceolate or sagittate. Ovary 3-loculed; ovules (1--)5--10 per locule. Fruit baccate, globose, 3-valved, indehiscent. Seeds (1--)5--8 per valve, purplish gray, polygonal, slightly flattened; hilum orbicular.

About 17 species: tropical, subtropical, and warm-temperate regions of the E hemisphere; eight species (one endemic) in China.

1 Leaves with petiole 1--4 cm, leaf blade 5--15(--25) cm; inflorescences shorter than or nearly as long as distal leaves, cincinni usually several, not in whorls.   (2)
+ Leaves sessile or base attenuate into short, winged petiole, leaf blade more than (10--)15 cm (except in P. macrobracteata); inflorescences very short or very long, cincinni in whorls or, if not, flowers very dense or inflorescence branched.   (5)
2 (1) Cincinni pendulous, umbel-like, much shorter than leaves   8 Pollia subumbellata
+ Cincinni spreading or ascending, paniculate, nearly as long as distal leaves.   (3)
3 (2) Petiole 2--4 cm, leaf blade 10--25 cm; fertile stamens 3   6 Pollia siamensis
+ Petiole less than 1.5 cm, leaf blade 5--15 cm; fertile stamens 6.   (4)
4 (3) Peduncle 2--6 cm; petiole wingless   5 Pollia miranda
+ Peduncle less than 2 cm; petiole winged   4 Pollia thyrsiflora
5 (1) Peduncle extremely short, less than 2 cm; whole inflorescence less than 6 cm, densely flowered; sepals persistent, abaxially pubescent   4 Pollia thyrsiflora
+ Peduncle more than 3 cm; whole inflorescence more than 8 cm, densely flowered or not; sepals persistent or not, abaxially puberulent or glabrous.   (6)
6 (5) Inflorescence branched, branches long, with several nodes and leaf sheaths; leaves abaxially rather densely pubescent; fertile stamens 3   7 Pollia secundiflora
+ Inflorescence without such branches; leaves abaxially glabrous; fertile stamens 6.   (7)
7 (6) Leaf sheaths less than 1 cm; involucral bracts ovate, herbaceous, apically broadly acute   3 Pollia macrobracteata
+ Leaf sheaths longer than 2 cm; involucral bracts lanceolate and apically acuminate if herbaceous, or apically emarginate if membranous.   (8)
8 (7) Inflorescence much longer than distal leaves, peduncle more than 15 cm, cincinni often in whorls; sepals persistent; petals ca. 3 mm   1 Pollia japonica
+ Inflorescence shorter than distal leaves, peduncle less than 10 cm, cincinni dense, often not in whorls; sepals caducous; petals ca. 5 mm   2 Pollia hasskarlii

Lower Taxa


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