Euphorbia hypericifolia

Linnaeus

Sp. Pl. 1: 454. 1753.

Common names: Graceful sandmat
Synonyms: Chamaesyce glomerifera Millspaugh C. hypericifolia (Linnaeus) Millspaugh Euphorbia glomerifera (Millspaugh) L. C. Wheeler
Treatment appears in FNA Volume 12. Treatment on page 272. Mentioned on page 255, 275, 279.

Herbs, annual, with taproot. Stems erect to ascending, 15–50 cm, glabrous. Leaves opposite; stipules connate, deltate, usually entire, sometimes laciniate-fringed at tip, 1.5–2.2 mm, glabrous; petiole 1–3 mm, glabrous; blade obliquely oblong-oblanceolate, 10–35 × 7–15 mm, base asymmetric, oblique, margins serrate or serrulate, especially toward apex, apex broadly acute, surfaces glabrous; palmately veined at base, pinnate distally. Cyathia in dense, axillary and terminal, capitate glomerules with reduced, bractlike leaves subtending cyathia; peduncle 0.5–1.8 mm. Involucre obconic, 0.9–1.1 × 0.4–0.9 mm, glabrous; glands 4, yellow-green to brown, stipitate, subcircular, 0.2 × 0.2 mm, occasionally nearly rudimentary; appendages absent on smaller glands or white to pink, shape highly variable, usually round to ± elliptic, 0.3–0.4 × 0.5–0.7 mm, distal margin entire. Staminate flowers (0–) 2–20. Pistillate flowers: ovary glabrous; styles 0.4 mm, 2-fid 1/2 length. Capsules depressed-globoid, 1.3–1.4 × 1.1–1.5 mm, glabrous; columella 1–1.1 mm. Seeds with very thin whitish mucilaginous coat over light-brown testa below, ovoid-triangular, bluntly 4-angled in cross-section, 0.9–1.1 × 0.5 mm, with shallow irregular depressions alternating with low, smooth ridges.


Phenology: Flowering and fruiting early spring–late fall.
Habitat: Open, disturbed areas, nurseries.
Elevation: 0–200 m.

Distribution

V12 691-distribution-map.jpg

Ala., Ark., Fla., Ga., La., Okla., S.C., Tex., West Indies, Central America, South America, in Asia, Pacific Islands

Discussion

Euphorbia hypericifolia is native to the New World tropics, and it is most likely adventive in the flora area (where it is most widely distributed in Florida and Texas). Reports from Arizona, California, and Maryland likely represent waifs or misidentifications.

Selected References

None.

Lower Taxa

None.
... more about "Euphorbia hypericifolia"
Victor W. Steinmann +, Jeffery J. Morawetz +, Paul E. Berry +, Jess A. Peirson +  and Ya Yang +
Linnaeus +
pinnate +  and asymmetric +
Anisophyllum +
1 cm10 mm <br />0.01 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
oblong-oblanceolate +
7mm;15mm +
0.13 cm1.3 mm <br />0.0013 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
0.11 cm1.1 mm <br />0.0011 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
mucilaginous +
0.1 cm1 mm <br />0.001 m <br /> (0.11 cm1.1 mm <br />0.0011 m <br />) +
Graceful sandmat +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
usually round +  and more or less elliptic +
Ala. +, Ark. +, Fla. +, Ga. +, La. +, Okla. +, S.C. +, Tex. +, West Indies +, Central America +, South America +, in Asia +  and Pacific Islands +
0–200 m. +
pistillate +  and staminate +
yellow-green +  and brown +
subtending +
rudimentary +
subcircular +
Open, disturbed areas, nurseries. +
axillary +  and terminal +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.11 cm1.1 mm <br />0.0011 m <br />) +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
caducous +, deciduous +  and persistent +
bractlike +
reduced +
palmate +  and pinnate +
serrulate +  and serrate +
toothed +  and entire +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
connate;distinct +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Flowering and fruiting early spring–late fall. +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.11 cm1.1 mm <br />0.0011 m <br />) +
4-angled +  and ovoid-triangular +
0.5 cm5 mm <br />0.005 m <br /> (?) +
free +, connate +  and distinct +
erect +  and ascending +
flattened +  and terete +
15 cm150 mm <br />0.15 m <br /> (50 cm500 mm <br />0.5 m <br />) +
interpetiolar +
? (?) +  and ? (?) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
connate +  and distinct +
0.4 cm4 mm <br />0.004 m <br /> (?) +
Chamaesyce glomerifera +, C. hypericifolia +  and Euphorbia glomerifera +
Euphorbia hypericifolia +
Euphorbia sect. Anisophyllum +
species +
light-brown +
axillary +  and terminal +
10 +, 9 +, 8 +, 7 +  and 6 +