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urban spurge

Everglade key sandmat

Habit Herbs, perennial, with slender, spreading rootstock. Herbs, annual, with taproot.
Stems

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

prostrate, ascending, to erect, 10–45 cm, pilose.

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 distinct, subulate, 1–2 mm, pilose;

petiole 0.9–1.5 mm, pilose;

blade oblanceolate to elliptic, 3–10 × 1–4 mm, base asymmetric, obtuse to hemicordate, margins coarsely serrate, sometimes revolute, apex rounded to acute, abaxial surface sparsely hispidulous to strigillose (densely so on young leaves), adaxial surface glabrous; 3-veined from base but 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, 1.1–1.4 × 0.5–0.7 mm, pilose;

glands 4, red, narrowly reniform, 0.1 × 0.2–0.4 mm;

appendages pink to red, larger 2 petal-like, smaller 2 elliptic, 0.4–1 × 0.3–0.5 mm, distal margin erose.

Staminate flowers

15–20.

5–8.

Pistillate flowers

ovary glabrous;

styles 1.2–2 mm, 2-fid.

ovary pilose;

styles 0.4–0.8 mm, 2-fid at apex.

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.

conic or truncate-ovoid, 1–1.2 mm diam., pilose;

columella 0.9–1.1 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.

orange-brown, glaucous, oblong, 4-angled in cross section, 0.7–0.8 × 0.4–0.5 mm, slightly rugose and with 3–4 transverse ridges.

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 (appearing clustered at points of new growth);

peduncle 0.4–0.6 mm.

Euphorbia agraria

Euphorbia conferta

Phenology Flowering and fruiting spring–summer. Flowering and fruiting year-round.
Habitat Grasslands, roadside banks, pastures. Sandy, disturbed, wet areas, often roadsides.
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
[BONAP county map]
Discussion

Euphorbia conferta is known only from Broward, Miami-Dade, and Monroe counties in southern Florida.

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

Source FNA vol. 12, p. 298. FNA vol. 12, p. 264.
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. 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
Synonyms Tithymalus agrarius Chamaesyce conferta
Name authority M. Bieberstein: Fl. Taur.-Caucas. 1: 375. (1808) (Small) B. E. Smith: J. Elisha Mitchell Sci. Soc. 62: 82. (1946)
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