Cnidoscolus stimulosus (Spurge-nettle)

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EUPHORBIACEAE

Euphorbiaceae

Cnidoscolus

Cnidoscolus stimulosus (Michaux) Engelmann & A. Gray. Common name: Spurge-nettle, Tread-softly, Finger-rot, Bull-nettle. Phenology: Late Mar-Aug; May-Sep. Habitat: Longleaf pine sandhill, dry sandy woodlands, other dry sandy soils. Distribution: Se. VA south to s. FL, west to e. LA, mostly on the Coastal Plain, but farther inland southward.

Origin/Endemic status: Endemic

Taxonomy Comments: Our species is allied to C. urens of Mexico, Central America, and n. South America, and is sometimes treated as a variety of it. Substantial variation in leaf shape, habitat and likely other characters suggest that several taxa may be currently subsumed here.

Synonymy ⓘ: = C, F, Fl2, FNA12, G, K4, RAB, S13, Va, W, WH3, Maya-Lastra & Steinmann (2018), McVaugh (1944); = Bivonea stimulosa (Michx.) Raf. — S; = Cnidoscolus urens (L.) Arthur var. stimulosus (Michx.) Govaerts — Govaerts, Frodin, & Radcliffe-Smith (2000); Jatropha stimulosa Michaux. Basionym: Jatropha stimulosa Michx. 1803

Links to other floras: = Cnidoscolus stimulosus - FNA12

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Heliophily ⓘ: 7

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Horticultural Information

Intro: Erect to reclining perennial of sandhills, dry sandy woodlands and other sites with dry sandy soils.

Stems: Stems branched, covered in stinging hairs.

Leaves: Leaves alternate, long-petiolate, round in overall outline, to 8 in. long, deeply palmately lobed, the 3-5 lobes entire to sharply toothed; with stinging hairs.

Inforescence:

Flowers: Flowers in loose, fork-branched, terminal clusters, with the central flower usually female and lateral flowers male; white, about 1 in. wide, consisting of 5 spreading, elliptic petal-like sepals (true petals absent) from a 1/2-in.-long tube.

Fruits: Fruit a spiny, 3-parted capsule.

Comments:

Height: 20-40 in.

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description: Erect to reclining perennial of sandhills, dry sandy woodlands and other sites with dry sandy soils.

stems: Stems branched, covered in stinging hairs.

leaves: Leaves alternate, long-petiolate, round in overall outline, to 8 in. long, deeply palmately lobed, the 3-5 lobes entire to sharply toothed; with stinging hairs.

inflorescence:

flowers: Flowers in loose, fork-branched, terminal clusters, with the central flower usually female and lateral flowers male; white, about 1 in. wide, consisting of 5 spreading, elliptic petal-like sepals (true petals absent) from a 1/2-in.-long tube.

fruits: Fruit a spiny, 3-parted capsule.

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Horticultural Information