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FNA | Family List | FNA Vol. 5 | Polygonaceae | Eriogonum

15. Eriogonum thornei (Reveal & Henrickson) L. M. Shultz, Harvard Pap. Bot. 3: 51. 1998.

Thorne's wild buckwheat

Eriogonum ericifolium Torrey & A. Gray var. thornei Reveal & Henrickson, Madroño 23: 205, fig. 1. 1975; E. ericifolium subsp. thornei (Reveal & Henrickson) Thorne

Subshrubs, spreading and matted, not scapose, 0.4-0.8 × 0.4-1(-2.5) dm. Stems spreading, with persistent leaf bases, up to 4 height of plant; caudex stems compact; aerial flowering stems spreading, slender, solid, not fistulose, 0.1-0.2 dm, floccose to slightly tomentose. Leaves cauline, 1 per node or fasciculate; petiole 0.01-0.02 cm, tomentose; blade linear, 0.4-0.6 × 0.05-0.1 cm, densely white-tomentose adaxially, finely villous and green adaxially, margins revolute.  Inflorescences umbellate-cymose, compact, 0.5-1 × 0.5-1 cm; branches usually dichotomous, otherwise with secondaries suppressed, glabrous or nearly so; bracts 3, scalelike, linear, 0.5-1 mm. Peduncles absent. Involucres 1 per node, turbinate, 1.5-2 × 1-1.5 mm, floccose; teeth 5, erect, 0.4-0.6 mm. Flowers 1.5-2 mm; perianth white, glabrous; tepals connate proximal 4, dimorphic, those of outer whorl obovate, 1-1.5 mm wide, those of inner whorl oblanceolate, 0.8-1 mm wide, connate proximally; stamens slightly exserted, 2-3 mm; filaments pilose proximally. Achenes light brown, 2-2.5 mm, glabrous except for papillate beak.

Flowering May-Jul. Copper-rich quartzite gravel on ridges, pinyon woodlands; 1800 m; Calif.

Eriogonum thornei is known from a single canyon area in the New York Mountains, San Bernardino County. Shultz elevated Thorne's wild buckwheat to species status when she proposed E. phoeniceum, here considered a variety of E. microtheca. Eriogonum thornei and E. ericifolium are weakly differentiated, with minimal morphologic differences, and yet they occur on different substrates and are well-removed biogeo­-graphically from each other. Thorne's wild buckwheat is a protected plant in California.


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