Thysanocarpus conchuliferus

Greene

Bull. Torrey Bot. Club 13: 218. 1886.

EndemicConservation concern
Synonyms: Thysanocarpus conchuliferus var. planiusculus B. L. Robinson Thysanocarpus laciniatus var. conchuliferus (Greene) Jepson
Treatment appears in FNA Volume 7. Treatment on page 740. Mentioned on page 739.

Stems 0.5–1.5 dm. Basal leaves: blade oblanceolate to elliptic, 1–2.5(–3.5) cm, margins often pinnatifid, sometimes sinuate-dentate, surfaces glabrous. Cauline leaves: blade lanceolate to narrowly elliptic, or nearly linear, widest near base or middle, base auriculate-clasping, auricles extending around stem (at least some leaves). Racemes: internodes 0.7–1.5(–2) mm in fruit. Fruiting pedicels stiffly divaricate-ascending to slightly recurved, (proximal) 3.5–6.5 mm. Fruits cymbiform, (wings strongly incurved toward flat side of fruit); valves glabrous; wing with spatulate lobes (these sometimes joined distally, 0.25–0.4 mm wide at narrowest), rays absent or indistinct.


Phenology: Flowering Mar–Apr.
Habitat: Rocky ridges, slopes, cliffs, canyons
Elevation: 50-500 m

Discussion

Of conservation concern.

Thysanocarpus conchuliferus is known from Santa Cruz Island, where T. laciniatus and T. curvipes also occur. Rarely, specimens of those two species will have slightly incurved wings, or fruits folded in pressing. In such cases, the very dense, short inflorescences of T. conchuliferus provide a useful distinguishing feature.

Thysanocarpus conchuliferus is in the Center for Plant Conservation’s National Collection of Endangered Plants.

Selected References

None.

Lower Taxa

None.
Patrick J. Alexander +  and Michael D. Windham +
Greene +
50-500 m +
Rocky ridges, slopes, cliffs, canyons +
Flowering Mar–Apr. +
Bull. Torrey Bot. Club +
Endemic +  and Conservation concern +
Thysanocarpus conchuliferus var. planiusculus +  and Thysanocarpus laciniatus var. conchuliferus +
Thysanocarpus conchuliferus +
Thysanocarpus +
species +