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Published In: Report on the United States and Mexican Boundary . . . Botany 2(1): 187. 1859. (Rep. U.S. Mex. Bound.) Name publication detailView in BotanicusView in Biodiversity Heritage Library
 

Project Name Data (Last Modified On 8/11/2017)
Acceptance : Accepted
Project Data     (Last Modified On 7/9/2009)
Status: Introduced

 

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20. Euphorbia stictospora Engelm. (mat spurge)

Chamaesyce stictospora (Engelm.) Small

Map 1682, Pl. 382 a–c

Plants annual, with taproots. Stems 5–45 cm long, usually prostrate, occasionally with ascending tips, several- to many-branched, the branches often overlapping (plants mat-forming), not flattened toward the tip, usually yellowish brown (sometimes slightly reddish-tinged), densely and evenly pubescent with spreading hairs. Leaves opposite, sessile or very short-petiolate. Stipules small scales 0.5–1.2 mm long, these not fused or, on 1 side of the stem, those from the adjacent leaf in each pair fused toward the base into a single small structure positioned between the leaf bases, variously entire to irregularly toothed or fringed. Leaf blades 3–10 mm long, oblong to oblong-obovate or occasionally nearly circular, asymmetrical at the base with the side toward the stem tip usually angled or rounded and the other side more or less truncate and expanded into a small, rounded auricle, broadly rounded to bluntly pointed or occasionally shallowly notched at the tip, the margins minutely or more deeply several-toothed (best observed with magnification), the upper surface sparsely to moderately pubescent with more or less spreading hairs and lacking a reddish spot, the undersurface moderately to densely pubescent with more or less spreading, slender hairs, often somewhat lighter green than the upper surface. Inflorescences axillary, of solitary cyathia or appearing as small clusters on short axillary branches. Involucre 0.7–1.0 mm long, moderately to densely hairy on the outer surface, the rim shallowly 5-lobed, the marginal glands 5, 0.1–0.3 mm long and often somewhat unequal in size, the body oblong, green to reddish purple, with a relatively inconspicuous petaloid appendage 0.1–0.3 mm long, this white to strongly pinkish- or reddish-tinged. Staminate flowers 3–9 per cyathium. Ovaries hairy, the styles 0.2–0.5 mm long, each entire or inconspicuously notched at the very tip. Fruits 1.5–2.3 mm long, moderately to densely pubescent with more or less spreading hairs, especially toward the angles. Seeds 1.0–1.5 mm long, oblong-ovate to ovate in outline, angular in cross-section, concave at the base, the surface finely pitted, some of the pits rarely forming shallow, irregular troughs and the seeds then appearing partially and irregularly few-ridged, light to dark brown, usually mottled, sometimes with a thin, white coating, this often wearing away irregularly, lacking a caruncle. July–October.

Introduced, uncommon, known only from historical collections from Jackson County (Arizona to Texas north to Wyoming and Iowa; Mexico; introduced sporadically east to New York). Dry, open, disturbed areas.

 
 


 

 
 
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