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eastern flowering spurge, flowering spurge, floweringspurge euphorbia

Habit Herbs, perennial, with deep, spreading rootstock.
Stems

erect or ascending, usually unbranched, occasionally few branched, solitary or few, previous year's dead stems not persistent, 20–100 cm, glabrous or slightly pilose to villous.

Leaves

alternate, ascending;

stipules 0.1–0.2 mm;

petiole minute or absent;

blade oblanceolate, obovate, or elliptic, 25–55 × 5–12 mm, base cuneate to rounded, margins entire, occasionally slightly revolute, apex rounded to subacute, abaxial surface glabrous or pilose to villous, adaxial surface usually glabrous, rarely villous;

venation occasionally obscure on small leaves, midvein conspicuous.

Involucre

campanulate, 1.2–1.5 × 1.2–1.5(–2) mm, glabrous or moderately puberulent (especially near glands);

glands 5, green, reniform, 0.5 × 0.8–1 mm;

appendages white, flabellate, 2.5–3.5(–4.5) × 2.5–3.2 mm, entire.

Staminate flowers

20–25.

Pistillate flowers

ovary glabrous;

styles 0.8–1.4 mm, 2-fid at apex to 1/2 length.

Capsules

globose, 2.3–3 × 3.5–4.2 mm, glabrous;

columella 2–2.5 mm.

Seeds

white or light gray, ovoid, 2.5–2.8 × 2.2 mm, with shallow and coarse depressions;

caruncle absent.

Cyathia

in terminal pleiochasia, dichasial bracts occasionally whorled or rarely alternate;

peduncle (1.5–)5–11(–13) mm (proximal to 70 mm), glabrous.

Euphorbia corollata

Phenology Flowering and fruiting early summer–fall.
Habitat Prairies, open fields, upland woods, glades, barrens, borders of swamps, roadsides, disturbed sites.
Elevation 0–1300 m. (0–4300 ft.)
Distribution
from FNA
AL; AR; CT; DE; GA; IA; IL; IN; KS; KY; LA; MA; MD; ME; MI; MN; MO; MS; NC; NE; NH; NJ; NY; OH; OK; PA; RI; SC; SD; TN; TX; VA; VT; WI; WV; ON
[WildflowerSearch map]
[BONAP county map]
Discussion

Euphorbia corollata is morphologically variable and widely distributed across a large part of eastern North America. The species appears to be expanding its range, as adventive populations have been reported from disturbed habitats at the northern edge of its range in Maine, Massachusetts, Michigan, Minnesota, New Hampshire, South Dakota, and Vermont.

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

Source FNA vol. 12, p. 244.
Parent taxa Euphorbiaceae > Euphorbia > sect. Alectoroctonum
Sibling taxa
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. 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 E. corollata var. molle, E. corollata var. viridiflora, E. marilandica, E. olivacea, Tithymalopsis corollata, T. olivacea
Name authority Linnaeus: Sp. Pl. 1: 459. (1753)
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