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FOC | Family List | FOC Vol. 6 | Caryophyllaceae | Arenaria

48. Arenaria nigricans Handel-Mazzetti, Symb. Sin. 7: 196. 1929.

变黑无心菜 bian hei wu xin cai

Herbs. Root solitary, small; rootlets white, long, fibrous. Stems branched at base, 10--25 cm, black glandular hairy. Basal leaves petiolate; leaf blade suborbicular. Cauline leaves with sheathing petiole; leaf blade narrowly elliptic to suborbicular, 1--4 × 0.7--1.5 cm, thick, bullate, both surfaces glabrous, base attenuate, margin ciliate, apex obtuse. Cymes many flowered; bracts ovate or broadly so, 5--8 mm, apex acute. Pedicel erect in fruit, 1--4 cm, becoming shorter distally on cymes, glandular villous. Sepals 5, orbicular, 4--5 mm, glandular pubescent abaxially, base narrowed, margin membranous, apex rounded. Petals 5, white, obovate, 1--2 × as long as sepals, apex truncate or emarginate. Floral disc small, with 5 subglobose glands. Stamens 10, equaling sepals; anthers yellow. Ovary turbinate-obovoid, ca. 1/3 as long as sepals. Styles 2, equaling ovary. Capsule 4-valved. Seeds brown, large, smooth, narrowly fimbriate. Fl. Jul--Sep.

* Limestone and montane rock crevices; 2600--3500 m. W Yunnan.

Two varieties have been recognized. The distinguishing characters seem to be only a matter of degree or ecologically induced, and the variation pattern should be studied in the field. Perhaps this variation should not be the basis for formal recognition of taxa.

1 Leaves 1.5--4 × 0.8--1.5 cm, changing to black when dry; petals 1.5--2 × as long as sepals   48a var. nigricans
+ Leaves 1--3 × ca. 0.7 cm, not changing to black when dry; petals subequaling sepals   48b var. zhenkangensis


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