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FOC | Family List | FOC Vol. 24 | Commelinaceae

4. Cyanotis D. Don, Prodr. Fl. Nepal. 45. 1825.
[nom. cons.]

蓝耳草属 lan er cao shu

Amischophacelus R. S. Rao & Kammathy.

Herbs annual or perennial, erect or creeping. Rhizomes absent. Leaves alternate. Cincinni sessile, subtended by spathelike involucral bracts; bracts imbricate, 2-seriate, falcate-curved. Flowers actinomorphic. Sepals free or connate only at base. Petals connate and tubular in middle, free at both ends, purple, blue, or white, linear-lanceolate. Stamens 6, all fertile, equal; filaments lanate, rarely glabrous; anther locules longitudinally dehiscent. Ovary 3-loculed; ovules 2 per locule. Capsule 3-valved, obovoid- or broadly oblong, trigonous. Seeds 1 or 2 per valve, cylindric or quadrangular, reticulate or pitted; hilum at adjoining end of 2 seeds.

About 50 species: tropical and subtropical Africa and Asia to N Australia; five species in China.

The petals are often described as connate basally; they are actually connate only in the middle part, but free at both ends.

1 Cincinni much reduced, with 3--6 flowers, enveloped in leaf sheath   5 Cyanotis axillaris
+ Cincinni with more flowers, subtended by spathelike bracts.   (2)
2 (1) Basal leaves rosulate; leaves, involucral bracts, and bracts usually densely arachnoid; roots 1--1.5 mm in diam.   2 Cyanotis arachnoidea
+ Basal leaves not rosulate; leaves, involucral bracts, and bracts hirsute or pubescent, rarely sparsely arachnoid; roots much thinner.   (3)
3 (2) Leaf blade usually narrowly oblong; cincinni numerous flowered, semicircular, obviously cristate; bracts to 7 mm wide, sparsely multicellular ciliate   3 Cyanotis cristata
+ Leaf blade linear or linear-lanceolate; cincinni not cristate; bracts much narrower, not ciliate.   (4)
4 (3) Plants with bulbs; seeds obviously striate and also finely reticulate   1 Cyanotis vaga
+ Plants without bulbs; seeds only finely reticulate   4 Cyanotis loureiroana

Lower Taxa


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