Flora of North America species comparison

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Croton setigerus

Croton californicus

dove weed, fish poison, turkey mullein

California croton, desert croton
Habit Herbs, annual, 0.5–5 dm, monoecious. Subshrubs or shrubs, 4–11 dm, dioecious.
Stems

densely and dichotomously shortly branched, forming loose, prostrate circular mats 5–80 cm across, proximally bristly stellate-hairy, central radii spreading, 2–3 mm.

loosely branched, stellate-lepidote.
Leaves

mostly clustered near inflorescences;

stipules rudimentary;

petiole 0.3–5 cm, glands absent at apex;

blade ovate to rhombic, 0.8–6.5 × 0.8–4 cm, base cuneate, margins entire, apex obtuse, abaxial surface pale grayish green, adaxial surface grayish green, both densely stellate-hairy.

not clustered;

stipules absent;

petiole 1–3.5(–4.5) cm, usually less than 1/2 blade length, glands absent at apex;

blade elliptic to narrowly oblong, 2–5.5(–7) × 0.8–2(–2.5) cm, usually more than 2 times as long as wide, base obtuse, margins entire, apex obtuse to rounded, abaxial surface light green, adaxial surface darker green, both stellate-lepidote.
Inflorescences

unisexual;

staminate dense capitate clusters, 1–2 cm, flowers 2–10;

pistillate clusters, 1–2 cm, flowers 1–3.

unisexual, racemes or thyrses;

staminate 0.5–3.5(–10) cm, flowers 3–8(–20);

pistillate 0.5–1 cm, flowers 1–6.
Pedicels

staminate 0–1 mm, pistillate absent.

staminate 1–5.5(–7) mm, pistillate to 1 mm (1–3 mm in fruit).
Staminate flowers

sepals 5–6, 2–2.5 mm, abaxial surface densely stellate-hairy;

petals 0;

stamens 5–9.

sepals 5, 1 mm, abaxial surface stellate-lepidote;

petals 0;

stamens 10–15.
Pistillate flowers

sepals 0;

petals 0;

ovary 1-locular;

style 1, 2–3 mm, unbranched.

sepals 5, equal, 2 mm, margins entire, apex incurved, abaxial surface stellate-lepidote;

petals 0;

ovary 3-locular;

styles 3, 2–2.5 mm, 4-fid, terminal segments usually 12.
Capsules

follicular (1-seeded), 3–6 × 2–3 mm, smooth;

columella absent.

6–8 × 5–7 mm, smooth;

columella 3-winged.
Seeds

3–5 × 2–3 mm, shiny.

4–5.5 × 3.5–5.5 mm, dull.
2n

= 20.

= 28.

Croton setigerus

Croton californicus
Phenology Flowering Jun–Oct. Flowering Feb–Oct.
Habitat Coastal sage scrub, foothill woodlands, valley grasslands, oak woodlands, edges of fields, dry stream beds, disturbed areas, roadsides. Sandy soils, sage scrub, dunes, washes.
Elevation 0–1900 m. (0–6200 ft.) 0–900 m. (0–3000 ft.)
Distribution
from FNA
AZ; CA; ID; NV; OR; UT; WA; Mexico (Baja California) [Introduced s South America (Chile), Australia]
[WildflowerSearch map]
from FNA
AZ; CA; NV; UT; Mexico (Baja California, Sinaloa)
[WildflowerSearch map]
[BONAP county map]
Discussion

Croton setigerus is nearly unique in the genus with its one-locular fruit, single unbranched style, and pistillate flowers devoid of any perianth. The foliage is toxic to animals, and the crushed plants were used by Native Americans to stupefy fish. The seeds are palatable to birds, giving rise to the common names cited above. Individual plants produce either mottled, striped, or solid gray or black seeds. Gray seeds are produced by desiccating plants and appear to be much less palatable to doves than the other color morphs (A. D. Cook et al. 1971).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 12, p. 223. FNA vol. 12, p. 211.
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. monanthogynus, C. parksii, C. pottsii, C. punctatus, C. sancti-lazari, C. soliman, C. sonorae, C. suaveolens, C. texensis, C. wigginsii
C. alabamensis, C. argenteus, C. argyranthemus, 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. monanthogynus, C. parksii, C. pottsii, C. punctatus, C. sancti-lazari, C. setigerus, C. soliman, C. sonorae, C. suaveolens, C. texensis, C. wigginsii
Synonyms Eremocarpus setigerus Hendecandra procumbens, C. californicus var. longipes, C. californicus var. mohavensis, C. californicus var. tenuis, C. longipes, C. mohavensis, C. tenuis
Name authority Hooker: Fl. Bor.-Amer. 2: 141. (1838) — (as setigerum) Müller Arg.: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 15(2): 691. (1866)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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