Crocanthemum nashii

(Britton) Barnhart

in J. K. Small, Man. S.E. Fl., 879. 1933.

Common names: Florida scrub frostweed or sunrose
Basionym: Helianthemum nashii Britton Bull. Torrey Bot. Club 22: 147. 1895 (as nashi)
Synonyms: H. thyrsoideum Barnhart
Treatment appears in FNA Volume 6. Treatment on page 406. Mentioned on page 400, 402.

Herbs. Stems from caudices and horizontal rootstocks, erect to ascending, 20–35(–41) cm, stellate-pubescent. Leaves cauline; petiole 1–2(–3) mm; blade oblanceolate-elliptic to lanceolate-elliptic, 15–30(–38) × 3–6(–8.4) mm, surfaces stellate-tomentose, without simple hairs, lateral veins slightly to moderately raised abaxially. Inflorescences terminal, thyrses; chasmogamous flowers 1–8 per thyrse, cleistogamous 8–40 per thyrse, flowering 1–3 months later than chasmogamous. Pedicels 3–8(–10) mm; bracts linear-lanceolate, 1–3.2 × 0.2–0.6 mm. Chasmogamous flowers: outer sepals linear, 1–3 × 0.3 mm, inner sepals ovate-elliptic, 3.5–5 × 2.7–3.7 mm, apex acute; petals broadly cuneate, 6–9.5 × 3–6.5 mm; capsules 2-valved, 3–4.8 × 2.4–3.8 mm, stellate-pubescent distally. Cleistogamous flowers: outer sepals linear, 0.5–1.2 × 0.5 mm, inner sepals ovate-elliptic, 1–3.4 × 1–2.3 mm, apex acute; capsules 2-valved, 3–4 × 2.4–3.5 mm, stellate-pubescent distally.

Phenology: Flowering Mar–Jun.
Habitat: Xeric sand-pine scrub and oak scrub, on stable maritime dunes, on inland sandhills
Elevation: 0–100 m


Crocanthemum nashii and C. arenicola are the only species in Crocanthemum with stellate-pubescent ovaries and capsules; C. nashii is unique in having two-valved capsules. It was discovered in New Hanover County, North Carolina, in 1997, disjunct some 540 km from the northernmost Florida populations. The uniformly gray-green foliage, thyrsoid inflorescence, and often patch-forming habit render it unmistakable within its range. Plants with simple hairs mixed with stellate hairs on the calyx were named Helianthemum thyrsoideum.

Selected References


Lower Taxa

... more about "Crocanthemum nashii"
Bruce A. Sorrie +
(Britton) Barnhart +
Helianthemum nashii +
Florida scrub frostweed or sunrose +
Fla. +  and N.C. +
0–100 m +
Xeric sand-pine scrub and oak scrub, on stable maritime dunes, on inland sandhills +
Flowering Mar–Jun. +
in J. K. Small, Man. S.E. Fl., +
H. thyrsoideum +
Crocanthemum nashii +
Crocanthemum +
species +