CYMOSA ssp. COSTAFOLIA Bartel & Shevock, 1990
Synonym : Dudleya costafolia (Bartel & Shevock) P.H.Thomson (1993)
Distribution : USA (California: Tulare County: Sequoia National Forest); limestone rocks, only known from the type locality.
Differs from ssp. cymosa :
Stems 1.5 - 2 cm in diameter.
Rosettes 1 - 5 (-7) cm in diameter, with 7 - 15 (-20) leaves, richly branched, densely cushion-forming with 5 - 40 rosettes per cushion.
Leaves (weakly) linear to linear-oblanceolate, (1-) 2 - 7 (-8) cm x 2.5 - 7 (-8) mm.
Inflorescence : Scape 5 - 15 (-20) cm, scorpioid branches 1 - 4 cm, with 2 - 7 flowers, pedicels erect, 2.5 - 9 (-17) mm.
Flowers : Calyx 4 - 6 mm, 2 - 5 x 2 - 4 mm, usually somewhat glaucous, petals erect, lanceolate to narrowly acute, spreading at the tips, 5 - 13 (-17) x 2 - 4 mm,
bright yellow, tube 1 - 3 mm.
Cytology : n = 17
Differs from all other subspecies of D. cymosa by its narrow leaves in numerous small and densely arranged rosettes (cf. protologue).
Note :
On www.crassulaceae.com this ssp. is wrongly listed as "C. abramsii ssp. costifolia". However the correct name is "costafolia" and it is a ssp. of D. cymosa.