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39. Diuranthera Hemsley, Hooker's Icon. Pl. 28:t. 2734. 1902.

鹭鸶兰属 lu si lan shu

Chen Xinqi (陈心启 Chen Sing-chi); Nicholas J. Turland

Diuranthera minor

Credit: Harvard University Herbaria

Herbs perennial, rhizomatous. Rhizome vertical, very short. Roots numerous, thickened, fleshy. Leaves several, all basal, tufted or arranged in a lax rosette, narrowly linear to linear-oblanceolate. Scape simple or few branched, longer than leaves, proximally with a few sterile bracts, terminating in a lax raceme. Bracts ovate to linear-lanceolate, usually shorter than flowers, membranous or ± so, veined. Flowers bisexual, usually paired, shortly pedicellate; pedicel articulate or not. Tepals 6, spreading or ± so, free, linear, 3--20-veined; outer ones slightly narrower or sometimes shorter than inner ones. Stamens 6, slightly shorter than tepals; filaments filiform; anthers dorsifixed at base, linear, base with 2 prominent, caudate appendages 1--3 mm. Ovary 3-loculed. Style filiform, long; stigma very small. Fruit a capsule, obovoid or ellipsoid, 3-angled, loculicidal. Seeds black, orbicular, flattened, base cordate.

* Four species: China.

Except for its prominently appendaged anthers, Diuranthera is very similar to Chlorophytum the similarity extending to the karyotypes, and some authors treat the former genus as a highly specialized member of the latter. However, the two are here distinguished at generic level.

1 Leaves densely white powdery abaxially; tepals yellow, ca. 20-veined, inner ones much longer than outer   2 Diuranthera chinglingensis
+ Leaves glabrous abaxially; tepals white, 3--5-veined, inner ones nearly as long as outer.   (2)
2 (1) Pedicels not articulate   1 Diuranthera inarticulata
+ Pedicels articulate.   (3)
3 (2) Leaves linear-oblanceolate, 15--65 × 0.7--3 cm, margin often somewhat undulate; tepals 3(--5)-veined; basal appendages of anthers 2--3 mm, apex acute   3 Diuranthera major
+ Leaves usually narrowly linear, 8--40 × 0.3--1 cm, margin flat; tepals 5-veined; basal appendages of anthers 1--1.5 mm, apex obtuse-rounded   4 Diuranthera minor

Lower Taxa


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