Grand Coulee Onion

Allium constrictum is known only from Douglas, Grant, and Lincoln counties.

Bulbs 1–5+, not clustered on stout, primary rhizome, ovoid, 1–1.5 × 0.8–1.4 cm; outer coats enclosing 1 or more bulbs, brownish, membranous, lacking cellular reticulation or cells arranged in only 2–3 rows distal to roots, ± quadrate, without fibers; inner coats white, cells obscure, quadrate. Leaves usually persistent, green at anthesis, 2, basally sheathing, sheaths not extending much above soil surface; blade solid, flat, broadly channeled, falcate, 10–35 cm × 1–3(–5) mm, margins entire. Scape persistent, solitary, erect, solid, terete, enlarged apically but distinctly constricted just proximal to inflorescence, 15–20 cm × 1.5–4 mm. Umbel persistent, erect, compact, 15–30-flowered, hemispheric to globose, bulbils unknown; spathe bracts persistent, 3, 5–7-veined, ovate, ± equal, apex acute. Flowers ± stellate, 7–8 mm; tepals spreading, light pink to rose with prominent green or reddish midribs, narrowly lanceolate, ± equal, becoming papery in fruit, margins entire, apex acuminate; stamens exserted; anthers blue-gray; pollen light blue to gray; ovary crested; processes 6, 2 per lobe, low, rounded, margins entire; style exserted, linear; stigma capitate, unlobed; pedicel 10–20 mm. Seed coat shining; cells smooth. 2n = 14.

Wash.

Flowering May--Jul.

Shallow, lithosolic soils, often dry and sandy; of conservation concern; 300--500m.

Allium douglasii Hooker var. constrictum Ownbey & Mingrone in C. L. Hitchcock et al., Vasc. Pl. Pacif. N.W. 1: 747. 1969

Allium constrictum, the Grand Coulee Onion, is a plant species endemic to the US State of Washington. It is known from only three counties in the east-central part of the state: Douglas, Grant, and Lincoln. It grows on dry, sandy soils at elevations of 300–500 m.

Allium constrictum produces egg-shaped bulbs up to 8 mm long. Flowers are up to 10 mm across, pink to rose with green midrib; anthers and pollen blue to gray

Allium constrictum adalah spesies tumbuhan yang tergolong ke dalam famili Amaryllidaceae. Spesies ini juga merupakan bagian dari ordo Asparagales. Spesies Allium constrictum sendiri merupakan bagian dari genus bawang Allium. Nama ilmiah dari spesies ini pertama kali diterbitkan oleh (Ownbey & Mingrone) P.M.Peterson.

Allium constrictum là một loài thực vật có hoa trong họ Amaryllidaceae. Loài này được (Mingrone & Ownbey) P.M.Peterson, Annable & Rieseberg mô tả khoa học đầu tiên năm 1988.