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

93. Eriogonum grande Greene, Pittonia. 1: 38. 1887.

Eriogonum latifolium Smith subsp. grande (Greene) S. Stokes; E. nudum Douglas ex Bentham var. grande (Greene) Jepson

Subshrubs or herbs, much-branched and matted, not scapose, (1-)5-15 × 2-8 dm, glabrous, rarely floccose. Stems spreading to erect, with persistent leaf bases, up to 4 height of plant; caudex stems matted; aerial flowering stems erect to spreading, usually stout, solid or hollow, occasionally fistulose, (0.8-)2-6 dm, glabrous, rarely floccose.  Leaves basal or sheathing up stems 0.5-3 dm; petiole 5-20 cm, floccose; blade oblong to oblong-ovate, (1.5-)3-10 × (1-)2-6 cm, densely white-tomentose abaxially, tomentose to floccose to subglabrous and greenish adaxially, margins plane, occasionally crisped. Inflorescences subcapitate to cymose, (5-)20-100 × 4-50 cm; branches usually dichotomous, glabrous, rarely floccose; bracts 3-8 or more, leaflike, oblong to oblong-ovate, and 5-20 × 5-10 mm proximally, scalelike, triangular, and 2-6 mm distally. Peduncles absent. Involucres 1-3 per cluster, turbinate-campanulate to campanulate, (4-)5-7 × 3-6 mm, floccose to subglabrous; teeth 5-8, erect, 0.3-0.6 mm. Flowers 2.5-3.5 mm; perianth white to pink, rose, or red, glabrous; tepals connate proximal 4, monomorphic, oblong-obovate; stamens exserted, 3-6 mm; filaments pilose proximally. Achenes brown, 2.5-3 mm, glabrous.

Varieties 4 (3 in the flora): California; nw Mexico.

In the flora area, Eriogonum grande is the insular phase of the E. nudum complex; var. testudinum Reveal is found on the mainland in Baja California, Mexico.

1 Perianths pink to red or rose; plants 2-5 dm; involucres 5-7 mm; San Miguel, Santa Cruz, and Santa Rosa islands, California   93c var. rubescens
+ Perianths white; plants 1-15 dm; involucres 4-6 mm; various islands of California, but not Santa Rosa Island   (2)
2 (1) Plants 5-15 dm; involucres 5-6 mm; Santa Cruz, San Miguel, Santa Catalina, Anacarpa, and San Clemente islands, California   93a var. grande
+ Plants 1-2(-2.5) dm; involucres 4-5 mm; San Nicolas Island, California   93b var. timorum


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