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FNA | Family List | FNA Vol. 12 | Euphorbiaceae

11. Argythamnia serrata (Torrey) Müller Arg., Linnaea. 34: 147. 1865. (as Argyrothamnia).

Yuma or New Mexico silverbush Yuma or New Mexico silverbush

Aphora serrata Torrey in W. H. Emory, Rep. U.S. Mex. Bound. 2(1): 197. 1859; Argythamnia californica Brandegee; A. dressleriana J. W. Ingram; A. gracilis Brandegee; A. micrandra Croizat; A. neomexicana Müller Arg.; A. serrata var. magdalenae Millspaugh; Ditaxis californica (Brandegee) A. Heller; D. dressleriana (J. W. Ingram) Radcliffe-Smith & Govaerts; D. gracilis Rose & Standley; D. micrandra (Croizat) Radcliffe-Smith & Govaerts; D. neomexicana (Müller Arg.) A. Heller; D. odontophylla Rose & Standley; D. serrata (Torrey) A. Heller; D. serrata var. californica (Brandegee) V. W. Steinmann & Felger; D. serrata var. magdalenae (Millspaugh) Eastwood

Herbs, annual or perennial, monoecious, to 5 dm. Stems erect or prostrate, usually densely to sparsely hairy, rarely glabrous, hairs malpighiaceous. Leaves: stipules deciduous, ovate, lanceolate to subulate, 0.5–2.3 mm, margins not glandular; petiole 1–10 mm; blade elliptic to ovate, obovate, or narrowly lanceolate, 1–10.5 × 0.2–3 cm, margins serrate, serrulate, or entire, without glands, surfaces usually densely to sparsely hairy, rarely glabrous, hairs malpighiaceous. Inflorescences bisexual, 0.4–1.5 cm; bracts ovate to elliptic, 0.8–2 mm, margins without glands. Flowers without pink dye when wetted. Staminate flowers: sepals lanceolate, 0.9–2.5 × 0.4–1.4 mm; petals elliptic to obovate, 1.5–3.5 × 0.6–2 mm, free from androphore; nectary glands elliptic to oblate, 0.3–0.5 × 0.1–0.2 mm, free from androphore, glabrous; stamens 10, staminodes 0 or 3–5, glabrous. Pistillate flowers: sepals lanceolate to elliptic, 2.3–6.5 × 0.6–1.6 mm, without glands; petals 5, elliptic, 0.7–3 × 0.4–1.6 mm; nectary glands elliptic, 0.4–0.6 × 0.3–0.4 mm, glabrous; ovary sericeous, strigose, or hispidulous; styles 1–1.8 mm, glabrous; stigmas terete. Capsules 1.8–4.5 mm, strigose-hispidulous. Seeds 1.5–2.4 mm, smooth, punctate, striate, or reticulate. 2n = 26 (Baja California Sur, Mexico).

Flowering year-round. Desert scrub, sandy, rocky, calcareous soils; 0–1600 m; Ariz., Calif., Nev., N.Mex., Tex.; Mexico; Central America (Guatemala, Nicaragua).

Argythamnia serrata is widely distributed and variable; six species have been described to recognize this variation. However, these groups overlap morphologically and geographically, and many specimens cannot be determined with confidence. A broadly defined A. serrata is therefore recognized here.


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