32. Euphorbia chaetocalyx (Boissier) Tidestrom, Proc. Biol. Soc. Wash. 48: 40. 1935.
Bristlecup sandmat Bristlecup sandmat
Euphorbia fendleri Torrey & A. Gray var. chaetocalyx Boissier in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 15(2): 39. 1862; Chamaesyce chaetocalyx (Boissier) Wooton & Standley
Herbs, perennial, with woody, thickened taproot. Stems usually erect, rarely slightly decumbent, often densely clustered from top of woody crown, 3–15 cm, glabrous. Leaves opposite; stipules distinct, narrowly linear, usually entire, 0.5–1 mm, glabrous; petiole 0.5–1 mm, glabrous; blade ovate to lanceolate or oblong- or linear-lanceolate, 3–11 × 0.8–3(–5) mm, base slightly asymmetric, short-tapered, occasionally one side slightly rounded, margins entire, apex acute or short-acuminate, surfaces glabrous; only midvein conspicuous. Cyathia solitary at distal nodes; peduncle 0.8–1.3 mm. Involucre campanulate to turbinate, 0.8–1.4 × 0.8–1 mm, glabrous; glands 4, yellow-brown to reddish, concave or convex, elliptic or oval, 0.2–0.4 × 0.4–0.6 mm; appendages absent or white, lanceolate-deltate to straplike, 0.2–1.1 × 0.2–0.9 mm, distal margin entire, crenate, or deeply cleft or divided. Staminate flowers 25–35. Pistillate flowers: ovary glabrous; styles 0.3–0.4 mm, 2-fid 1/2 length. Capsules depressed-ovoid to depressed-globose, 1.7–2.1 × 1.6–2.4 mm, glabrous; columella 1.2–1.8 mm. Seeds white, ovoid-pyramidal, prominently 4-angled in cross section, 1.6–2 × 1–1.2 mm, smooth to slightly wrinkled.
Varieties 2 (2 in the flora): sw, sc United States, n Mexico.
Euphorbia chaetocalyx is similar to E. fendleri but can generally be distinguished from that species by its narrow, acute leaves and ± erect stems. Some authors have used the presence or absence and shape of the involucral gland appendages to help separate E. chaetocalyx from E. fendleri, but those characters appear highly variable and of little taxonomic utility. Some individuals from western Texas (Culberson and El Paso counties) and southern New Mexico appear intermediate with E. fendleri. The specific epithet of E. chaetocalyx refers to the bristly perianthlike segments that subtend the ovary, but these structures are found intermittently in both E. chaetocalyx and E. fendleri.