Flora of North America species comparison

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Croton linearis

Croton parksii

grannybush, pineland croton

Parks' croton
Habit Shrubs, 10–20 dm, dioecious. Herbs, annual, 5–15 dm, dioecious.
Stems

well branched from base, stellate-hairy.

much-branched distally, stellate-hairy.
Leaves

not clustered;

stipules rudimentary;

petiole 0.3–1 cm, 1/10–1/7 leaf blade length, often with 2 sessile or stipitate glands at apex;

blade linear to narrowly oblong, 3–7 × 0.3–1.5 cm, mostly more than 4 times as long as wide, base cuneate to obtuse, margins entire, apex obtuse to acute, abaxial surface whitish yellow, densely appressed stellate-hairy, adaxial surface green, glabrous or minutely stellate-puberulent.

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, racemes; staminate 4–10 cm, flowers 10–30; pistillate 3–5 cm, flowers 5–12.

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 1–2 mm, pistillate 2–3 mm.

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

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

petals 5–6, spatulate, obtuse, 1.5–2.5 mm, abaxial surface glabrous except margins ciliate;

stamens 12–17.

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

petals 0;

stamens 10–15.
Pistillate flowers

sepals 5, equal, 2.5–3.5 mm, margins entire, apex incurved, abaxial surface canescent;

petals rudimentary or 0;

ovary 3-locular;

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

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

5–7 × 4–5 mm, smooth;

columella with 3 rounded, inflated lobes.

8–9 × 9–10 mm, verrucose;

columella 3-winged.
Seeds

3–4 × 1.5–2 mm, dull.

6–7 mm diam., shiny.

Croton linearis

Croton parksii
Phenology Flowering year-round. Flowering Jun–Dec.
Habitat Rocky limestone pinelands, coastal areas. Deep sandy soils.
Elevation 0–30 m. (0–100 ft.) 0–50 m. (0–200 ft.)
Distribution
from FNA
FL; West Indies
[WildflowerSearch map]
from FNA
TX
[BONAP county map]
Discussion

Croton linearis in the flora area is found only in Martin, Miami-Dade, Monroe (Keys only), Palm Beach, and St. Lucie counties.

There has been some confusion in the past with the application of the name C. cascarilla (Linnaeus) Linnaeus to this taxon, but C. cascarilla is now considered to be a synonym of the West Indian C. eluteria (Linnaeus) W. Wright (B. W. van Ee and P. E. Berry 2010b).

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

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. 219. FNA vol. 12, p. 221.
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. michauxii, C. monanthogynus, 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. 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
Synonyms C. fergusonii
Name authority Jacquin: Enum. Syst. Pl., 32. (1760) — (as lineare) 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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