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Balkan spurge, egg-leaf spurge, oblong spurge

hairy-fruit spurge

Habit Herbs, perennial, with woody taproot. Herbs, annual, with taproot.
Stems

erect, unbranched or densely branching, 80 cm, often densely villous (especially young stems and pleiochasial branches).

erect, 13–20 cm, both pilose to villous and densely strigillose;

branches ± straight.

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.

usually opposite, occasionally alternate at distal nodes;

petiole 3–15 mm, pilose;

blade narrowly to broadly elliptic, or lanceolate to ovate, 30–80 × 10–15 mm, base cuneate to rounded, margins coarsely crenate-dentate, strigose, revolute to nearly flat, apex broadly acute to acuminate, or obtuse, abaxial surface pilose, adaxial surface sparsely strigose-hirsute;

venation pinnate, midvein prominent.

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.

campanulate to slightly cylindric, 2.3 × 1.2 mm, glabrous;

involucral lobes divided into several linear, smooth lobes;

gland 1, yellow-green, stipitate, clavate, 1–1.2 × 0.8–0.9 mm, opening bilabiate and oblong, glabrous;

appendages absent.

Staminate flowers

15–40.

3–5.

Pistillate flowers

ovary glabrous;

styles 1.5–2 mm, 2-fid.

ovary pilose;

styles 1.2 mm, 2-fid nearly entire length.

Capsules

globose, 3–4.5 × 3–4.5 mm, slightly 3-lobed;

cocci rounded, verrucose-tuberculate, glabrous;

columella 2.5–3.3 mm.

broadly ovoid, 2.2–3 × 1.9–2.7 mm, 3-lobed, pilose;

columella 2–2.4 mm.

Seeds

brown, ovoid, 2.4–2.6 × 1.3–2 mm, smooth, caruncle reniform, 0.2–0.3 × 0.8–0.9 mm.

gray-brown to pale gray, pyramidally ovoid, angular in cross section, 2.3–2.6 × 2.4–2.6 mm, coarsely tuberculate, tubercles in 2 transverse rows;

caruncle 0.2–0.4 mm.

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 usually 3, occasionally reduced to congested cyme, 1–2-branched;

pleiochasial bracts 2–4, often whorled, wholly green or paler green at base, similar in shape and size to distal leaves or slightly narrower;

dichasial bracts highly reduced.

Cyathia

peduncle 1–5 mm.

peduncle 0.5–0.8 mm.

2n

= 56.

Euphorbia oblongata

Euphorbia cuphosperma

Phenology Flowering and fruiting spring–fall. Flowering and fruiting summer–fall.
Habitat Waste areas, disturbed sites, roadsides, fields, pastures. Open montane and canyon forests, pinyon-juniper forests, montane grasslands, stream beds, disturbed habitats.
Elevation 30–900 m. (100–3000 ft.) 800–2000 m. (2600–6600 ft.)
Distribution
from FNA
CA; OR; WA; s Europe [Introduced in North America]
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; NM; Mexico; Central America (Guatemala)
[WildflowerSearch map]
[BONAP county map]
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.)

Source FNA vol. 12, p. 305. FNA vol. 12, p. 319.
Parent taxa Euphorbiaceae > Euphorbia > subg. Esula Euphorbiaceae > Euphorbia > sect. Poinsettia
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. 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. 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. 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 oblongatus E. dentata var. cuphosperma, Poinsettia cuphosperma
Name authority Grisebach: Spic. Fl. Rumel. 1: 136. (1843) (Engelmann) Boissier: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 15(2): 73. (1862)
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