Flora of China
  FOC Vol.6 (2001)              | Family List  Caryophyllaceae  PDF Arenaria  PDF   | Link Font:+ Big | - Small
   48. Arenaria nigricans  Handel-Mazzetti
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.

1Leaves 1.5--4 × 0.8--1.5 cm, changing to black when dry; petals 1.5--2 × as long as sepals48a  var. nigricans    变黑无心菜(原变种)
+Leaves 1--3 × ca. 0.7 cm, not changing to black when dry; petals subequaling sepals48b  var. zhenkangensis    镇康无心菜