Euphorbia missurica

Rafinesque

Atlantic J. 1: 146. 1832.

Common names: Prairie or Missouri spurge prairie sandmat
Endemic
Synonyms: Chamaesyce missurica (Rafinesque) Shinners Euphorbia missurica var. intermedia (Engelmann) L. C. Wheeler E. petaloidea var. intermedia Engelmann
Treatment appears in FNA Volume 12. Treatment on page 278. Mentioned on page 255, 258, 281.

Herbs, annual, with taproot. Stems erect or ascending, 10–60(–100) cm, glabrous, sometimes ± glaucous. Leaves opposite; stipules usually distinct, occasionally connate basally on one or both sides of stem, linear to triangular-subulate, usually deeply and irregularly fringed or lobed, rarely entire, 0.7–1.5 mm, glabrous; petiole 1–3 mm, glabrous; blade linear to narrowly oblong or narrowly lanceolate-oblong, (4–)8–30 × 3–7 mm, base symmetric or subsymmetric (usually narrower leaves), or slightly asymmetric and angled or short-tapered (wider leaves), margins entire, occasionally ± revolute, apex rounded to truncate, occasionally emarginate or mucronulate, abaxial surface pale green, adaxial surface light to bright green, both surfaces glabrous; venation obscure. Cyathia solitary or in small, cymose clusters these occasionally subtended by reduced, bractlike leaves at distal nodes or on congested, axillary branches; peduncle 1–5(–11) mm. Involucre broadly campanulate, 1.2–1.8 × 1.7–1.9 mm, glabrous; glands 4, yellowish green, broadly oblong to nearly circular, cupped or folded, 0.3–0.6 × 0.3–0.7 mm; appendages white or ± pinkish tinged, ovate to oblong-ovate, 0.4–2.5 × 1.1–1.7 mm, distal margin entire or slightly crenate or emarginate at tip. Staminate flowers 24–60. Pistillate flowers: ovary glabrous; styles 0.5–1.4 mm, 2-fid 1/2 length. Capsules broadly ovoid-globose, 1.9–2.5 × 2–2.5(–3) mm, glabrous; columella 1.8–2.1 mm. Seeds mottled whitish to brown, ovoid to broadly ovoid-triangular, bluntly 3-angled in cross section, 1.5–2 × 1.1–1.4 mm, smooth or slightly wrinkled.


Phenology: Flowering and fruiting late spring–late summer.
Habitat: Glades, ledges, bluff tops (usually calcareous), dry upland forest margins, sandy or disturbed areas.
Elevation: 50–1500 m.

Distribution

V12 666-distribution-map.jpg

Ark., Colo., Iowa, Kans., Mo., Mont., Nebr., N.Mex., N.Dak., Okla., S.Dak., Tex., Wyo.

Discussion

Euphorbia missurica is similar to the western E. parryi but has a more upright growth habit and more conspicuous involucral gland appendages. Native occurrences have been documented from Minnesota (last collected in Ottertail County in 1936), but it appears to have been extirpated from that state due to habitat loss to agriculture.

Selected References

None.

Lower Taxa

None.
... more about "Euphorbia missurica"
Victor W. Steinmann +, Jeffery J. Morawetz +, Paul E. Berry +, Jess A. Peirson +  and Ya Yang +
Rafinesque +
Anisophyllum +
Prairie or Missouri spurge +  and prairie sandmat +
Ark. +, Colo. +, Iowa +, Kans. +, Mo. +, Mont. +, Nebr. +, N.Mex. +, N.Dak. +, Okla. +, S.Dak. +, Tex. +  and Wyo. +
50–1500 m. +
Glades, ledges, bluff tops (usually calcareous), dry upland forest margins, sandy or disturbed areas. +
Flowering and fruiting late spring–late summer. +
Atlantic J. +
Chamaesyce missurica +, Euphorbia missurica var. intermedia +  and E. petaloidea var. intermedia +
Euphorbia missurica +
Euphorbia sect. Anisophyllum +
species +