Chamaesyce stictospora (Engelm.) Small (redirected from: Euphorbia stictospora)
Family: Euphorbiaceae
slimseed sandmat,  more...
[Euphorbia stictospora Engelm.]
Chamaesyce stictospora image
Max Licher  
Plant: Prostrate annual forb branching from central point; herbage pubescent, with milky sap Leaves: leaves opposite, inequilateral at base, margins irregularly serrate on upper half Flowers: flowers monoecious borne in cyathia; petaloid appendages white (minute); ovary and capsule more heavily pubescent on base than anywhere else, ~1.5 mm long; seeds punctately pitted and mottled.
A chiefly sw. sp. with virtually entire styles, and with mottled, punctate-pitted seeds depressed-punctate at base and sharply acute at the tip, barely encroaches into our range in w. Io.

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

©The New York Botanical Garden. All rights reserved. Used by permission.
Wiggins 1964, Kearney and Peebles 1969, FNA 2016, Allred and Ivey 2012
Duration: Annual Nativity: Native Lifeform: Forb/Herb General: Annual herb, from a slender taproot; stems usually prostrate, 5-25 cm long, sometimes with ascending tips, covered with white spreading hairs. Leaves: Opposite along the stems, on petioles 1 mm long; blade ovate to obovate or oblong, 3-10 mm long and 2-6 mm wide, with an asymmetric base and a serrate margin, at least near the leaf tip; upper leaf surface sparsely villous to glabrate, and the lower surface usually more densely pubescent; stipules distinct or united, narrow-triangular, about 1 mm long. Flowers: Has the highly modified flower structure characteristic of Euphorbias. Structures called cyathia appear to be individual flowers, but are composed of fused-together bracts forming a cup (involucre), with peripheral nectary glands which are often subtended by petal-like bracts called petaloid appendages. Within the cup there is a ring of inconspicuous male flowers, each reduced to a single stamen. Out of the middle protrudes a single, stalked female flower which lacks petals. In E. setiloba, the cyathia (flower structures) are clustered on dense leafy lateral branches, or sometimes solitary in the leaf axils. Involucres are cone-shaped, 1 mm high, and pubescent on the outside, with 4 red glands around the edge, which are not all the same size (unequal); each gland has a white to pink 3-lobed petaloid appendage (sometimes 1 or more of the petaloid appendages are absent, or rudamentary; occasionally all are absent); 3-9 staminate flowers. Fruits: Capsule ovoid, 2 mm high, and hairy, the hairs concentrated on the angles; containing 3 brown, usually mottled or irregularly white-coated seeds, these 1 mm long, narrowly oblong-ovoid to ellipsoid and 3–4-angled in cross section, with a few short, irregu Ecology: Found on rocky hillsides and washes, from 3,500-5,500 ft (1067-1676 m); flowers May-October. Distribution: AZ east to TX, north to ND; south to c MEX. Notes: This species belongs to the Chamaesyce subgenus of Euphorbia. Some treatments, even recent ones, continue to treat Chamaesyce as a separate genus even though molecular evidence places it within Euphorbia. Chamaesyce spp are distinct based on their leaves which are always opposite and and often have asymmetric bases; cyathia (flower structures) in leaf axils, not at branch tips, and usually with petaloid appendages; and stipules present and not gland-like. E. stictospora is a prostrate (ground-hugging) annual distinguished by its stems which have long-spreading, soft hairs; leaves and seed pods covered with appressed hairs; small leaves less than 1.5 cm long, which are serrate mostly near the tips; and cyathia (flower structures) in clusters along the central stem between leaves, with white petaloid appendages. Ethnobotany: Unknown Etymology: Euphorbia is named for Euphorbus, Greek physician of Juba II, King of Mauretania, while stictospora means narrow seed. Editor: SBuckley 2010, FSCoburn 2015, AHazelton 2017
Chamaesyce stictospora image
Max Licher  
Chamaesyce stictospora image
Max Licher  
Chamaesyce stictospora image
Patrick Alexander  
Chamaesyce stictospora image
Patrick Alexander  
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
David Thornburg  
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image
Chamaesyce stictospora image