半日花Helianthemum songaricum Schrenk

别名：好日敦－哈日;

科名：半日花科 Cistaceae

属名：半日花属 Helianthemum

《中国植物志》第50(2)卷178页
  1.半日花 图版38: 6-9
  Helianthemum songaricum Schrenk in Fisch. et Mey. Enum. Pl. Nov. Schrenk 1: 94, 1841: Ledeb. Fl. Ross. 1: 241, 1842.; S. V. Juzepczuk in Fl. URSS. 15: 338, 1949. “soongoricum”; 中国高等值物图鉴2: 899, 图3528, 1972,“soongoricum ”.
  矮小灌木，多分枝，稍呈垫状，高5-12厘米，老枝褐色，小枝对生或近对生，幼时被紧贴的白色短.柔毛，后渐光滑，先端成刺状，单叶对生，革质，具短柄或几无柄，披针形或狭卵形，长5-7（10）毫米，宽1-3毫米，全缘，边缘常反卷，两面均被白色短柔毛，中脉稍下陷；托叶钻形，线状披针形，先端锐，长约0.8毫米，较叶柄长。花单生枝顶，径1-1.2厘米；花梗长0.6-1厘米，被白色长柔毛，萼片5，背面密生白色短柔毛，不等大，外面的2片线形，长约2毫米，内面的3片卵形，长5-7毫米，背部有3条纵肋；花瓣黄色，淡桔黄色，倒卵形，楔形，长约8毫米；雄蕊长约为花瓣的1/2，花药黄色；子房密生柔毛，长约1.5毫米，花柱长约5毫米。蒴果卵形，长约5-8毫米，外被短柔毛。种子卵形，长约3毫米，渐尖，褐棕色，有棱角，具纲纹，有时有绉缩。
  产新疆、甘肃河西、内蒙古（伊克昭盟西部）。超旱生植物，为古老的残遗种，生于草原化荒漠区的石质和砾质山坡。苏联中亚也有分布。
  本种地上部分含红色物质，可作红色染料。

《Flora of China》 Vol. 13 (2007)
Helianthemum songaricum  Schrenk
半日花   ban ri hua
Helianthemum ordosicum Y. Z. Zhao et al.
Shrubs dwarf, densely branched, cushionlike, 5-12 cm tall. Old branches brown; branchlets opposite or nearly opposite, tightly appressed white pubescent when young, glabrescent, apex spinose. Leaves opposite; stipules subulate or linear-lanceolate, ca. 0.8 mm, longer than petiole, apex acute; petiole short to almost absent; leaf blade simple, lanceolate or narrowly ovate, 5-7(-10) × 1-3 mm, leathery, both surfaces white puberulous, margin entire, often revolute; midrib slightly impressed. Flowers solitary at tips of branches, 1-1.2 cm in diam.; pedicel 0.6-1 cm, white villous. Sepals 5, unequal, abaxially densely white puberulous; outer 2 sepals linear, ca. 2 mm; inner 3 sepals ovate, 5-7 mm, abaxially 3-ridged. Petals yellow or orange-yellow, obovate, ca. 8 mm, base cuneate. Stamens ca. 1/2 as long as petals; anthers yellow. Ovary ca. 1.5 mm, densely puberulous; style ca. 5 mm. Capsule ovoid, 5-8 mm, puberulous. Seeds brown, ovoid, ca. 3 mm, angled, reticulate-striate, sometimes rugose, apex acuminate.
Rocky hills and slopes in steppe-desert regions; 1000-1400 m. Gansu, Nei Mongol, Xinjiang [C Asia].
Helianthemum songaricum is easily distinguished from other C Asian species by the spine-tipped branches and stipulate leaves. It was listed as rare by Zhou (in Fu & Jin, China Pl. Red Data Book 1: 218-219. 1992).