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FOC | Family List | FOC Vol. 5 | Chenopodiaceae

32. Arthrophytum Schrenk, Bull. Cl. Phys.-Math. Acad. Imp. Sci. Saint-Pétersbourg, sér. 2. 3: 211. 1845.

节节木属 jie jie mu shu

Subshrubs or shrubs, glabrous or with papillate processes. Annual branches terete or obtusely 4-angled, jointed, slightly fleshy. Leaves opposite, sessile, linear, semiterete or clavate, fleshy, rarely subulate or scale-like, base slightly expanded, apex obtuse or with a short, acicular awn; leaf axil usually cottony. Flowers solitary in leaf axils, bisexual, with 2 bractlets. Perianth subglobose; segments 5, orbicular to broadly elliptic, herbaceous, abaxially somewhat thickened, bearing a transverse, winglike process a little below apex in fruit, adaxially convex, margin membranous, apex usually recurved. Disk cupular or discoid, usually with 5 interstaminal lobes. Stamens 5, inserted on disk; filaments subulate, compressed; anthers broadly ovate-cordate, apex without an appendage or mucronate. Style very short, apex slightly contracted; stigmas 2-5-lobed. Utricle enclosed in perianth, hemispheric, apex truncate or somewhat convex; pericarp fleshy. Seed horizontal; embryo spiral; perisperm absent.

About 20 species: C Asia; three species in China.

1 Annual branches with more than 10 internodes; disk membranous; leaves subulate or scale-like; plants not cushion-shaped.   3 A. iliense
+ Annual branches with 2-4 internodes; disk fleshy; leaves clavate or semiterete; plants cushion-shaped.   (2)
2 (1) Leaves linear, semiterete, covered with papillate processes; disk discoid.   1 A. longibracteatum
+ Leaves clavate, smooth; disk cupular.   2 A. korovinii

Lower Taxa


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