Hemiscola diffusa

(Banks ex de Candolle) H. H. Iltis

Novon 17: 448. 2007.

Common names: Spreading spiderflower
Basionym: Cleome diffusa Banks ex de Candolle in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 1: 241. 1824
Synonyms: Cleome aculeata var. diffusa (Banks ex de Candolle) Kuntze
Treatment appears in FNA Volume 7. Treatment on page 220. Mentioned on page 221.

Plants 10–30(–90) cm. Stems delicately branched; glandular-papillose. Leaves: stipular spines 0.5 mm; petiole 4–15 cm; leaflets 3 proximally, 1 distally, blade obovate, 1–2.5 × 0.5–1.2 cm, margins serrate, apex acute to obtuse or acuminate, surfaces glabrous or sparsely glandular-pubescent abaxially, glabrate adaxially. Racemes 5–10 cm (8–12 cm in fruit); bracts unifoliate, elliptic, 4–15 mm. Pedicels 4–6 mm. Flowers: sepals deciduous, brownish green, ovate, 1–2.5(–3) × 1–2 mm, margins serrulate, glabrous; petals yellow or creamy white, 5–10 × 1.5–3 mm; stamens (staggered) ,yellow, 5–9 mm; anthers 0.3–0.5 mm; gynophore 2–4 mm in fruit; ovary 3 mm; style 0.1–0.2 mm. Capsules 15–20 × 3–6 mm, glabrous. Seeds 10–13, dull reddish brown to black, oblong or comma-shaped (compressed), 2–3 × 2 mm, tuberculate, (aril white).

Phenology: Flowering summer.
Habitat: Disturbed areas
Elevation: 0-10 m


V7 311-distribution-map.gif

Introduced; Ala., South America.


The only record of Hemiscola diffusa from the flora area is a collection from ballast in Mobile in 1893 (Mohr s.n., NY, US).

Selected References


Lower Taxa