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

101. Eriogonum crocatum Davidson, Bull. S. Calif. Acad. Sci. 23: 17, plate E. 1924.

Saffron wild buckwheat

Eriogonum saxatile S. Watson var. crocatum (Davidson) Munz

Herbs, erect to spreading, not scapose, 3-5 × 5-10 dm, lanate to tomentose. Stems spreading, usually without persistent leaf bases, up to 1/ 4 height of plant; caudex stems matted to spreading; aerial flowering stems spreading to erect, slender, solid, not fistulose, 0.2-1 dm, lanate to tomentose.  Leaves cauline, 1 per node; petiole 0.3-1.2 cm tomentose; blade broadly ovate, 1-3(-3.5) × 0.8-2.5(-3) cm, lanate to tomentose. Inflorescences cymose-umbellate, 0.5-3 × 3-8 cm; branches umbellate, lanate to tomentose; bracts 3, scalelike, triangular, 1-2.5 mm. Peduncles absent. Involucres 1 per node, broadly campanulate, 3-4 × 3-5 mm, tomentose; teeth 5-6, erect, 0.5-1 mm. Flowers 5-6 mm, including elongate, rounded, slightly winged, stipelike base; perianth bright yellow, glabrous; tepals connate proximally, dimorphic, those of outer whorl narrowly oblong, 3-4 × 0.7-0.9 mm, those of inner whorl oblong to spatulate, 3.5-5 × 1-1.5 mm; stamens exserted, 3-5 mm; filaments pilose proximally. Achenes brown, 3-gonous, 2.5-3 mm. 2n = 40.

Flowering Apr-Jul. Sandstone slopes, oak woodlands; of conservation concern; 60-200 m; Calif.

Eriogonum crocatum is known only from the Conejo Grade area of the Santa Monica Mountains in Ventura County. A population in the Malibu Hills of Los Angeles County sampled by M. E. Jones (26 Apr 1926, DS, POM) has not been rediscovered. The species is rare, and the state of California considers it worthy of protection. Federal action has been long delayed. The species is widely cultivated and is one of the more popular wild buckwheats in the garden. Great care should be taken to prevent its escape from cultivation.


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