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

1d. Eriogonum Michaux subg. Eriogonum

Herbs, erect, polycarpic perennials, tomentose or glabrous; taproot woody. Stems erect, tomentose to floccose or glabrous; caudex stems absent; aerial flowering stems erect, slender to stout, solid, not hollow, fistulose, or disarticulating in ringlike segments proximally, arising directly from the root. Leaves usually persistent, basal or cauline, 1 per node or fasciculate; blade tomentose abaxially. Inflorescences terminal, cymose, open; branches mostly dichotomous, not disarticulating into ringlike segments, round and smooth or finely striated or grooved, tomentose; bracts 3(-5), connate basally, scalelike or leaflike. Peduncles absent or erect and stout. Involucres 1 per node, not appressed to the inflorescence branches, turbinate to campanulate; teeth 5, erect, apex acute. Flowers attenuate at base, with stipelike base 0.5-7 mm; perianth cream to light tan or yellow, densely pubescent abaxially, glabrous adaxially; tepals connate proximally 1/ 1/ 3 their length, monomorphic or dimorphic; stamens exserted; filaments glabrous or densely pilose. Achenes brown, not winged, 3-gonous, glabrous or pubescent. Seeds: embryo straight.

Species 2 (2 in the flora): United States.

1 Tepals monomorphic; perianths densely white- or silvery-tomentose abaxially; filaments glabrous; Arkansas, Kansas, New Mexico, Oklahoma, and Texas e to Alabama, Florida, Kentucky, and Tennessee   105 Eriogonum longifolium
+ Tepals dimorphic; perianths densely tannish- to rusty-lanate abaxially; filaments pilose; se Alabama, Florida, Georgia, and South Carolina   106 Eriogonum tomentosum


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