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one-seed croton, prairie tea

three-seed croton

Habit Herbs, annual, 2–5 dm, monoecious. Herbs, annual, 1–5 dm, monoecious.
Stems

dichotomously branched from near base, stellate-hairy, some stellate hairs with dark brown centers.

dichotomously branched, densely stellate-tomentose.

Leaves

sometimes clustered near inflorescences;

stipules glandlike, 0.1–0.3 mm;

petiole 0.3–1.5 cm, glands absent at apex;

blade ovate-oblong to nearly round (proximal) to narrowly elliptic (distal), 1–3.5 × 0.5–3 cm, base obtuse to rounded or truncate, margins entire, apex rounded to acute, abaxial surface pale green, sparsely whitish stellate-hairy and appearing brown-dotted, some hairs with dark brown centers, adaxial surface darker green, densely stellate-hairy, hairs without brown centers.

sometimes clustered near inflorescences;

stipules rudimentary;

petiole 0.5–3 cm, glands absent at apex;

blade lanceolate to suborbiculate, 1–5(–8) × 0.8–2.8(–3.5) cm, base rounded, margins entire, apex rounded to acute, abaxial surface pale green, stellate-hairy, adaxial surface darker green, sparsely stellate-hairy.

Inflorescences

bisexual or sometimes pistillate, congested racemes, 0.3–1 cm, staminate flowers 3–10, pistillate flowers 1–2(–5).

bisexual, racemes, 1–3 cm, not appearing brown-dotted, no stellate hairs with brown centers, staminate flowers 3–8, pistillate flowers 1–3.

Pedicels

staminate 0.5–2 mm, pistillate 1–2.5 mm (2–3 mm and recurved in fruit).

staminate 2–3 mm, pistillate 1–5(–15) mm.

Staminate flowers

sepals 3–5, 0.7–1 mm, abaxial surface stellate-hairy;

petals 3–5, narrowly elliptic-oblanceolate, 0.7–1 mm, abaxial surface glabrous except margins villous;

stamens 3–5.

sepals (4–)5, 1.5–2 mm, abaxial surface stellate-hairy;

petals 5, linear-oblong-lanceolate, 1–1.5 mm, abaxial surface glabrous except margins villous;

stamens 7–9(–12).

Pistillate flowers

sepals 5, subequal, 1.5–2 mm, margins entire, apex straight to slightly incurved, abaxial surface stellate-hairy, some hairs with dark brown centers;

petals 0;

ovary 2-locular, 1 fertile;

styles 2, 0.8–1.2(–1.5) mm, 2-fid to base, terminal segments 4.

sepals 5–6, equal, 3 mm, margins entire, apex incurved, abaxial surface stellate-hairy;

petals 0;

ovary 3-locular;

styles 3, 2–3 mm, 2-fid to base, terminal segments 6.

Capsules

appearing follicular (1-seeded), 3.5–4.5 × 1.8–2.2 mm, smooth;

columella ± curved, apparently deciduous upon dehiscence of capsule.

4–5 × 4–4.5 mm, smooth;

columella apex with 3 sharp projections.

Seeds

2.5–3.3 × 2–2.5 mm, shiny.

3.2–3.6 × 1.5 mm, shiny.

2n

= 20.

Croton monanthogynus

Croton lindheimerianus

Phenology Flowering May–Nov.
Habitat Prairies, sandstone and limestone glades, thinly wooded bluffs, fallow fields, other disturbed habitats.
Elevation 0–1000 m. (0–3300 ft.)
Distribution
from FNA
AL; AR; AZ; GA; IA; IL; IN; KS; KY; LA; MD; MI; MO; MS; NC; NE; NM; OH; OK; PA; SC; TN; TX; VA; WI; WV; Mexico (Coahuila, Nuevo León, San Luis Potosí, Tamaulipas)
[WildflowerSearch map]
[BONAP county map]
from FNA
AR; AZ; IL; IN; KS; LA; MO; NC; NM; OK; SC; TX; n Mexico
[WildflowerSearch map]
[BONAP county map]
Discussion

Croton monanthogynus may be adventive in the northernmost states.

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

Varieties 2 (2 in the flora).

Croton lindheimerianus is one of the bifid-styled species in sect. Heptallon.

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

Key
1. Leaf blades suborbiculate, length mostly less than 2 times width, apex rounded to broadly acute; plants densely velvety appressed-tomentose; pedicels, at least some, recurved in fruit.
var. lindheimerianus
1. Leaf blades lanceolate, length mostly more than 2 times width, apex acute; plants roughly tomentose; pedicels erect in fruit.
var. tharpii
Source FNA vol. 12, p. 220. FNA vol. 12, p. 219.
Parent taxa Euphorbiaceae > Croton Euphorbiaceae > Croton
Sibling taxa
C. alabamensis, C. argenteus, C. argyranthemus, C. californicus, C. capitatus, C. ciliatoglandulifer, C. cortesianus, C. coryi, C. dioicus, C. elliottii, C. fruticulosus, C. glandulosus, C. heptalon, C. humilis, C. incanus, C. leucophyllus, C. lindheimeri, C. lindheimerianus, C. linearis, C. michauxii, C. parksii, C. pottsii, C. punctatus, C. sancti-lazari, C. setigerus, C. soliman, C. sonorae, C. suaveolens, C. texensis, C. wigginsii
C. alabamensis, C. argenteus, C. argyranthemus, C. californicus, C. capitatus, C. ciliatoglandulifer, C. cortesianus, C. coryi, C. dioicus, C. elliottii, C. fruticulosus, C. glandulosus, C. heptalon, C. humilis, C. incanus, C. leucophyllus, C. lindheimeri, C. linearis, C. michauxii, C. monanthogynus, C. parksii, C. pottsii, C. punctatus, C. sancti-lazari, C. setigerus, C. soliman, C. sonorae, C. suaveolens, C. texensis, C. wigginsii
Subordinate taxa
C. lindheimerianus var. lindheimerianus, C. lindheimerianus var. tharpii
Synonyms Engelmannia nuttalliana, Gynamblosis monanthogyna, Heptallon ellipticum, Oxydectes monanthogyna
Name authority Michaux: Fl. Bor.-Amer. 2: 215. (1803) — (as monanthogynum) Scheele: Linnaea 25: 580. (1852)
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