Euphorbia oblongata |
Euphorbia rosescens |
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Balkan spurge, egg-leaf spurge, oblong spurge |
rosy-pink spurge, scrub spurge |
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Habit | Herbs, perennial, with woody taproot. | Herbs, perennial, with thickened rootstock. |
Stems | erect, unbranched or densely branching, 80 cm, often densely villous (especially young stems and pleiochasial branches). |
erect or ascending, 15–45 cm. |
Leaves | petiole absent; blade oblong to narrowly obovate or lanceolate, 15–70 × 6–25 mm, base rounded or truncate, margins finely serrulate, apex obtuse, mucronulate, surfaces glabrous; venation inconspicuously pinnate, midvein prominent. |
petiole indistinct, blade narrowly elliptic, elliptic, narrowly oblong, or obovate, 25–55 × 5–21 mm, thick and fleshy, base attenuate, apex acute or mucronulate; only midvein evident. |
Involucre | cupulate to slightly turbinate, 1.5–2.5 × 1.3–1.5 mm, glabrous; glands 2–3, elliptic, 0.6–0.8 × 0.8–1.2 mm; horns absent. |
obconic to campanulate, 2.4–3.6 × 2.5–3.6 mm, lobes ovate to oblong, 0.7–1 mm, ciliate; glands green to yellow, oblong or trapezoidal, 0.9–1.7 × 1.9–2.5 mm, distal margins crenulate-erose. |
Staminate flowers | 15–40. |
25. |
Pistillate flowers | ovary glabrous; styles 1.5–2 mm, 2-fid. |
mature gynophore not seen, styles connate 1/2 length, 3.3–3.6 mm. |
Capsules | globose, 3–4.5 × 3–4.5 mm, slightly 3-lobed; cocci rounded, verrucose-tuberculate, glabrous; columella 2.5–3.3 mm. |
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Seeds | brown, ovoid, 2.4–2.6 × 1.3–2 mm, smooth, caruncle reniform, 0.2–0.3 × 0.8–0.9 mm. |
not seen. |
Cyathial | arrangement: terminal pleiochasial branches 3–5, each 2–3 times 2–4-branched; pleiochasial bracts ovate, similar in size to distal leaves; dichasial bracts distinct, ovate to suborbiculate, base truncate or rounded, margins entire or finely denticulate, apex obtuse, sometimes mucronulate; axillary cymose branches 0–4. |
arrangement: terminal pleiochasial branches 3, 7–16 cm, 4–7 times 2-branched; pleiochasial bracts ovate to oblong, 17–31 × 13–14 mm, margins entire, apex acute, often also mucronulate; dichasial bracts ovate or lanceolate, 6–18 × 8–12 mm, margins entire, apex acute, often also mucronate; axillary cymose branches 1–2. |
Cyathia | peduncle 1–5 mm. |
peduncle 3.9–6.8 mm. |
Mature | capsules not seen. |
|
Euphorbia oblongata |
Euphorbia rosescens |
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Phenology | Flowering and fruiting spring–fall. | Flowering and fruiting spring–summer, rarely fall. |
Habitat | Waste areas, disturbed sites, roadsides, fields, pastures. | Xeric oak and pine scrub, mostly on white sands, disturbed habitats. |
Elevation | 30–900 m. (100–3000 ft.) | 20–50 m. (100–200 ft.) |
Distribution |
CA; OR; WA; s Europe [Introduced in North America]
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FL |
Discussion | Euphorbia oblongata is listed as a noxious weed by the states of California, Oregon, and Washington. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Euphorbia rosescens is a narrow-endemic, gap-specialist known only from the southern portion of the Lake Wales Ridge in Highlands County. Based on leaf characteristics, it appears to be most similar to E. telephioides. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 12, p. 305. | FNA vol. 12, p. 316. |
Parent taxa | Euphorbiaceae > Euphorbia > subg. Esula | Euphorbiaceae > Euphorbia > sect. Nummulariopsis |
Sibling taxa | ||
Synonyms | Tithymalus oblongatus | |
Name authority | Grisebach: Spic. Fl. Rumel. 1: 136. (1843) | E. L. Bridges & Orzell: Lundellia 5: 71, fig. 4. (2002) |
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