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urban spurge

coastal beach sandmat

Habit Herbs, perennial, with slender, spreading rootstock. Subshrubs or shrubs, perennial, with thickened and often woody rootstock.
Stems

erect or ascending, unbranched or branched, 30–90 cm, glabrous.

erect to ascending, or nearly decumbent in shifting sand, 25–60 cm, glabrous.

Leaves

petiole absent;

blade oblong-elliptic, 20–65 × 9–20 mm, base truncate to auriculate, margins entire, apex obtuse to rounded, surfaces glabrous;

venation conspicuously pinnate, midvein prominent.

opposite;

stipules connate, forming conspicuous, ligulate or deltate scale, short cleft or fringed, 1–1.8 mm, glabrous;

petiole 0.5–1 mm, glabrous;

blade ovate to elliptic often folded along midrib, 5–12 × 3–8 mm, ± fleshy, base slightly asymmetric, truncate to cordate, partially obscuring stem, margins entire, apex usually obtuse, rarely acute, surfaces yellowish to dark green, glabrous glaucous; obscurely 3–5-veined at base, pinnate distally, only midvein conspicuous.

Involucre

campanulate, 2.2–3 × 1.8–2 mm, glabrous;

glands 4, crescent-shaped; 0.6–1 × 1–2 mm;

horns slightly divergent to convergent, 0.1–0.2 mm.

campanulate, 1–1.6 × 0.7–1.2 mm, glabrous;

glands 4, brown, usually elliptic, occasionally almost round, 0.2–0.4 × 0.5–0.7 mm, fleshy;

appendages white, oblong, rarely rudimentary, 0.2–0.4 × 0.5–0.9 mm, distal margin entire or undulate.

Staminate flowers

15–20.

12–20.

Pistillate flowers

ovary glabrous;

styles 1.2–2 mm, 2-fid.

ovary glabrous;

styles 0.3–0.4 mm, 2-fid 1/2 length.

Capsules

globose, 2–2.8 × 2.2–2.7 mm, 3-lobed;

cocci rounded, smooth except finely granulate toward abaxial line, glabrous;

columella 2.1–2.7 mm.

subglobose subtended by calyxlike structure, 1.5–2 × 2.2–2.8 mm, glabrous;

columella 1–1.5 mm.

Seeds

gray or whitish, ovoid-oblong, 2–2.1 × 1.2–1.3 mm, smooth;

caruncle ± rounded and flattened, 0.8 × 0.6 mm.

ashen, broadly ovoid, angled in cross section, faces plump, convex, 1.2–1.3 × 0.9–1.2 mm, obscurely pitted.

Cyathial

arrangement: terminal pleiochasial branches 8–15, 1–2 times 2-branched;

pleiochasial bracts similar in shape but shorter and narrower than distal leaves;

dichasial bracts distinct, rhombic to reniform, base obtuse, margins entire, apex obtuse, mucronate;

axillary cymose branches 12–23.

Cyathia

peduncle 0–2 mm.

solitary at distal nodes;

peduncle 0.5–1 mm.

Euphorbia agraria

Euphorbia mesembrianthemifolia

Phenology Flowering and fruiting spring–summer. Flowering and fruiting year-round.
Habitat Grasslands, roadside banks, pastures. Sandy and rocky shores, associated beach scrub.
Elevation 200–1600 m. (700–5200 ft.) 0–10 m. (0–0 ft.)
Distribution
from FNA
KS; MT; NE; NY; PA; WA; WY; AB; SK; Europe [Introduced in North America]
[WildflowerSearch map]
[BONAP county map]
from FNA
FL; Mexico; West Indies; Bermuda; South America (Colombia, Venezuela)
[BONAP county map]
Discussion

Euphorbia mesembrianthemifolia is found in the flora area along the sandy and rocky shores of southern Florida from Pinellas and Volusia counties southward. It is one of the few members of subg. Chamaesyce in the flora area that is a shrub or subshrub.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 12, p. 298. FNA vol. 12, p. 277.
Parent taxa Euphorbiaceae > Euphorbia > subg. Esula Euphorbiaceae > Euphorbia > sect. Anisophyllum
Sibling taxa
E. aaron-rossii, E. abramsiana, E. acuta, E. albomarginata, E. alta, E. angusta, E. antisyphilitica, E. arizonica, E. astyla, E. austrotexana, E. bicolor, E. bifurcata, E. bilobata, E. blodgettii, E. bombensis, E. brachycera, E. capitellata, E. carunculata, E. chaetocalyx, E. chamaesula, E. cinerascens, E. commutata, E. conferta, E. cordifolia, E. corollata, E. crenulata, E. cumulicola, E. cuphosperma, E. curtisii, E. cyathophora, E. cyparissias, E. davidii, E. deltoidea, E. dendroides, E. dentata, E. discoidalis, E. eriantha, E. exigua, E. exserta, E. exstipulata, E. falcata, E. fendleri, E. florida, E. floridana, E. garberi, E. georgiana, E. geyeri, E. glyptosperma, E. golondrina, E. gracillima, E. graminea, E. helioscopia, E. helleri, E. heterophylla, E. hexagona, E. hirta, E. hooveri, E. humistrata, E. hypericifolia, E. hyssopifolia, E. indivisa, E. innocua, E. inundata, E. ipecacuanhae, E. jaegeri, E. jejuna, E. laredana, E. lasiocarpa, E. lata, E. lathyris, E. longicruris, E. lurida, E. macropus, E. maculata, E. marginata, E. meganaesos, E. melanadenia, E. mendezii, E. mercurialina, E. mesembrianthemifolia, E. micromera, E. misera, E. missurica, E. myrsinites, E. nephradenia, E. nutans, E. oblongata, E. ocellata, E. ophthalmica, E. ouachitana, E. parishii, E. parryi, E. pediculifera, E. peplidion, E. peplus, E. perennans, E. pergamena, E. pinetorum, E. platyphyllos, E. platysperma, E. polycarpa, E. polygonifolia, E. polyphylla, E. porteriana, E. prostrata, E. pubentissima, E. purpurea, E. radians, E. rayturneri, E. revoluta, E. roemeriana, E. rosescens, E. schizoloba, E. serpens, E. serpillifolia, E. serrata, E. serrula, E. setiloba, E. simulans, E. spathulata, E. stictospora, E. strictior, E. telephioides, E. terracina, E. tetrapora, E. texana, E. theriaca, E. thymifolia, E. tithymaloides, E. trachysperma, E. trichotoma, E. vallis-mortae, E. velleriflora, E. vermiculata, E. villifera, E. virgata, E. wrightii, E. yaquiana
E. aaron-rossii, E. abramsiana, E. acuta, E. agraria, E. albomarginata, E. alta, E. angusta, E. antisyphilitica, E. arizonica, E. astyla, E. austrotexana, E. bicolor, E. bifurcata, E. bilobata, E. blodgettii, E. bombensis, E. brachycera, E. capitellata, E. carunculata, E. chaetocalyx, E. chamaesula, E. cinerascens, E. commutata, E. conferta, E. cordifolia, E. corollata, E. crenulata, E. cumulicola, E. cuphosperma, E. curtisii, E. cyathophora, E. cyparissias, E. davidii, E. deltoidea, E. dendroides, E. dentata, E. discoidalis, E. eriantha, E. exigua, E. exserta, E. exstipulata, E. falcata, E. fendleri, E. florida, E. floridana, E. garberi, E. georgiana, E. geyeri, E. glyptosperma, E. golondrina, E. gracillima, E. graminea, E. helioscopia, E. helleri, E. heterophylla, E. hexagona, E. hirta, E. hooveri, E. humistrata, E. hypericifolia, E. hyssopifolia, E. indivisa, E. innocua, E. inundata, E. ipecacuanhae, E. jaegeri, E. jejuna, E. laredana, E. lasiocarpa, E. lata, E. lathyris, E. longicruris, E. lurida, E. macropus, E. maculata, E. marginata, E. meganaesos, E. melanadenia, E. mendezii, E. mercurialina, E. micromera, E. misera, E. missurica, E. myrsinites, E. nephradenia, E. nutans, E. oblongata, E. ocellata, E. ophthalmica, E. ouachitana, E. parishii, E. parryi, E. pediculifera, E. peplidion, E. peplus, E. perennans, E. pergamena, E. pinetorum, E. platyphyllos, E. platysperma, E. polycarpa, E. polygonifolia, E. polyphylla, E. porteriana, E. prostrata, E. pubentissima, E. purpurea, E. radians, E. rayturneri, E. revoluta, E. roemeriana, E. rosescens, E. schizoloba, E. serpens, E. serpillifolia, E. serrata, E. serrula, E. setiloba, E. simulans, E. spathulata, E. stictospora, E. strictior, E. telephioides, E. terracina, E. tetrapora, E. texana, E. theriaca, E. thymifolia, E. tithymaloides, E. trachysperma, E. trichotoma, E. vallis-mortae, E. velleriflora, E. vermiculata, E. villifera, E. virgata, E. wrightii, E. yaquiana
Synonyms Tithymalus agrarius Chamaesyce buxifolia, C. mesembrianthemifolia, E. buxifolia
Name authority M. Bieberstein: Fl. Taur.-Caucas. 1: 375. (1808) Jacquin: Enum. Syst. Pl., 22. (1760)
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