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Flora of Taiwan | Family List

Commelinaceae A. Rich., Consp. 57. 1828 et Fl. Abyss. 2: 34. 1850; Wight, Ic. Pl. Ind. Or. 6: 28. 1853; Brückner in Engler, Naturlich. Pflanzenfam. ed. 2, 15a: 159. 1930; Brenan, J. Linn. Soc. Bot. 59: 349. 1966; D. Y. Hong, Acta Phytotax. Sin. 12 (4): 459, 1974; K. C. Hsu in Li et al., Fl. Taiwan 5: 157. 1978; Faden in Dahlgren et al., Fam. Monocot. 381. 1985; Cook, Aqu. Wetl. Pl. Ind. 85. 1996; D. Y. Hong et al., Fl. Reipubl. Popularis Sin. 13 (3): 70. 1997.

鴨跖草科

Jenn-Che Wang

Cyanotis arachnoidea
http://192.192.42.4/~tbgweb/non-cgi/usr/45/45_414_1.jpg

Credit: HAST

Commelineae R. Brown, Prodr. 268. 1810. Commelynaceae S. Endl., Gen. Pl. 124. 1836-1840. Commelyneae C. S. Kunth, Enum. Pl. 4: 34.1843.

Annual or perennial plants, some with stolons. Roots generally thin and fibrous, rarely uniformly thickened or tuberous. Stems erect, ascending or decumbent. Leaves linear, lanceolate or ovate; sheath cylindrical, usually fuse. Prophyll sheathing, membranous, at the base of branches. Inflorescence terminal, rarely axillary, a cincinnus, drepanium, thyrses or simple. Flowers bisexual, or bisexual and male, actinomorphic or zygomorphic, trimerous; sepals 3, green, persistent; petals 3, white, blue or purple, free or fused below; stamens 6, all alike or heteromorphic with 2-3 fertile stamens and 3-4 staminodes, filaments glabrous or barbate; ovary superior, bilocular or trilocular, style glabrous or barbate. Fruits a capsule, dehiscent, rarely indehiscent. Seeds uniseriate, rarely biseriate, embryotega lateral, semilateral, dosal or apical, hilum punctiform or linear.

The family of about 40 genera with ca. 650 species, distributed in warm regions. Tropical Africa; Mexico and northern Central America; and the Indian subcontinent are three major centres of taxonomic diversity. Eight genera with twenty-five species in Taiwan.


KEY TO GENERA

1 Filaments of stamens barbate   (2)
+ Filaments of stamens glabrous   (5)
       
2 (1) Fertile stamens 2-3, staminodes3-4   Murdannia
+ Fertile stamens 6, all alike   (3)
       
3 (2) Inflorescence perforating the leaf-sheath; flowers white; seeds with orange fleshy arils, embryotega semilateral, hilum curved   Amischotolype
+ Inflorescence not perforating the leaf-sheath; flowers pink-purple; seeds without arils, embryotega horizontal apical, hilum punctiform   (4)
       
4 (3) Leaves linear to lanceolate; inflorescence a capitate cyme, terminal or axillary; petals connate below into a tube   Cyanotis
+ Leaves ovate-lanceolate; inflorescence a capitate cyme or simple, terminal; petals free   Belosynapsis
       
5 (1) Stamens trimorphic   (6)
+ Stamens monomorphic or dimorphic   (7)
       
6 (5) Inflorescence constituenting of 1-2 cincinni, included in a large spathe, antherodes cruciate   Commelina
+ Inflorescence a thyrses, without spathe, antherodes bilobed   Rhopalephora
       
7 (5) Sepals glabrous,; fruits indehiscent; seeds biseriate in each locule   Pollia
+ Sepals covered with glandular hairs; fruits dehiscent; seeds uniseriate in each locule   Floscopa

Lower Taxa


 

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