Leavenworthia crassa var. elongata Rollins

Stems (when present) 1-4 dm. Basal leaves: petiole (0.9-)1.5-3 cm; blade 2.8-6.5(-8) cm, lobes 1-8 on each side, margins entire or shallowly dentate, terminal lobe orbicular to broadly ovate, 0.5-1.2(-2) cm × 5-11(-18) mm, considerably larger than lateral lobes, margins entire or shallowly dentate. Fruiting pedicels: solitary flowers 40-80 mm; racemes 35-70 mm. Flowers: sepals widely spreading, oblong-linear, 4-5.7 × 1-2.1 mm; petals spreading, usually yellow, sometimes white, broadly spatulate to obovate, 9.5-14 × (2.5-)3-6.7(-8) mm, claw yellow to orange, 2.5-4 mm, apex deeply emarginate, apical notch 0.5-1 mm deep; filaments: median 4-6 mm, lateral 1.6-3 mm; anthers 0.9-1.3 mm. Fruits subglobose to oblong, (0.6-)0.8-1.2(-1.4) cm × (3.5-)4-5(-6) mm, smooth, subterete; valves thick; ovules 4-6(-8) per ovary; style 2.2-5(-6) mm. Seeds 1.7-3.4 mm diam.; wing 0.2-0.4 mm wide; embryo straight or nearly so. 2n = 22.

Flowering Mar-Apr. Limestone cedar glades, pastures, fields, roadsides, near limestone sinks; of conservation concern; 150-300 m; Ala.

Leavenworthia crassa is known only from Lawrence and Morgan counties.

SELECTED REFERENCES Lloyd, D. G. 1967. The genetics of self-incompatibility in Leavenworthia crassa Rollins (Cruciferae). Genetica 38: 227-242. Lyons, E. E. and J. Antonovics. 1991. Breeding system evolution in Leavenworthia: Breeding system variation and reproductive success in natural populations of Leavenworthia crassa (Cruciferae). Amer. J. Bot. 78: 270-287.