Flora of North America species comparison

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Croton parksii

Parks' croton
Habit Herbs, annual, 5–15 dm, dioecious.
Stems

much-branched distally, stellate-hairy.
Leaves

not clustered;

stipules rudimentary;

petiole 0.5–1.5 cm, glands absent at apex;

blade elliptic, 2.5–6 × 1–2 cm, base rounded, margins entire, apex short-rounded, abaxial surface grayish green, densely stellate-tomentose, adaxial surface olive green, stellate-tomentose.
Inflorescences

unisexual;

staminate subspicate to racemose or paniculate, 3–6 cm, flowers 3–20;

pistillate capitate, 0.1–0.7 cm, flowers 1–3.
Pedicels

staminate 0.5–2 mm, pistillate 0.5–1.5 mm (1–3.5 mm in fruit).
Staminate flowers

sepals (5–)6, 3 mm, abaxial surface lanose, margins ciliate;

petals 0;

stamens 10–15.
Pistillate flowers

sepals 5, equal, 2 mm, margins entire, apex incurved and ± hooded, abaxial surface densely stellate-hairy;

petals 0;

ovary 3-locular;

styles 3, 2 mm, irregularly 2–3 times 2-fid, terminal segments 24, forming matted cluster.
Capsules

8–9 × 9–10 mm, verrucose;

columella 3-winged.
Seeds

6–7 mm diam., shiny.

Croton parksii
Phenology Flowering Jun–Dec.
Habitat Deep sandy soils.
Elevation 0–50 m. (0–200 ft.)
Distribution
from FNA
TX
[BONAP county map]
Discussion

Croton parksii, found on the southern Gulf Coastal Plain, is closely related to C. texensis, with which it shares capsules with conspicuous scurfy bumps covered by stellate hairs. Although they appear to intergrade where their ranges overlap around Wilson County, they can generally be distinguished by C. parksii being more robust, with larger capsules and seeds, and more densely tomentose leaves.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 12, p. 221.
Parent taxa 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. pottsii, C. punctatus, C. sancti-lazari, C. setigerus, C. soliman, C. sonorae, C. suaveolens, C. texensis, C. wigginsii
Name authority Croizat: Bull. Torrey Bot. Club 69: 445, 457. (1942)
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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