Flora of North America species comparison

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Stillingia treculiana

Trecul's toothleaf
Habit Herbs, perennial, with woody taproot.
Stems

fascicled, spreading, branching throughout, 1–4.5 dm.
Leaves

alternate;

stipules linear, to 1 mm;

petiole absent;

blade usually obovate-spatulate, rarely narrowly elliptic, 1–-4 × 0.5–1.5 cm, base cuneate, margins coarsely spinulose-dentate, teeth without prominent blackened tips, not incurved, apex rounded to obtuse;

midrib prominent, secondary veins obscure.
Inflorescences

pedunculate, 2.5–-5 cm;

staminate flowers ± widely spaced, 1 per node;

pistillate flowers 3–4, widely spaced;

bracts ovate, 1 mm, apex mucronate, glands patelliform, ± sessile, 0.7 mm diam.
Staminate flowers

calyx 1 mm.
Pistillate flowers

sepals fugacious, 3, minute;

styles connate only at base, 1.5 mm.
Capsules

ovoid-pyriform, 4 × 5 mm, deeply 3-lobed;

lobes of gynobase to 1 mm;

columella persistent.
Seeds

gray to black, ellipsoid, 2.5 × 2 mm, smooth;

caruncle minute.

Stillingia treculiana
Phenology Flowering Mar–May; fruiting (Mar–)Apr–Jul(–Dec).
Habitat Calcareous sandy soils, gravelly soils, and uplands.
Elevation 0–1000 m. (0–3300 ft.)
Distribution
from FNA
TX; Mexico (Coahuila, Nuevo León, Tamaulipas)
[BONAP county map]
Discussion

Stillingia treculiana is known in the flora area from the western Edwards Plateau south to the lower Rio Grande valley.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 12, p. 237.
Parent taxa Euphorbiaceae > Stillingia
Sibling taxa
S. aquatica, S. linearifolia, S. paucidentata, S. spinulosa, S. sylvatica, S. texana
Synonyms Gymnanthes treculiana
Name authority (Müller Arg.) I. M. Johnston: Contr. Gray Herb. 68: 91. (1923)
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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