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FNA | Family List | FNA Vol. 8 | Crassulaceae | Dudleya

12. Dudleya saxosa (M. E. Jones) Britton & Rose, New N. Amer. Crassul. 15. 1903.

Panamint dudleya Panamint dudleya

Cotyledon saxosa M. E. Jones, Contr. W. Bot. 8: 28. 1898 (as saxosum)

Caudices simple or apically branched, cespitose, 0.1-5 × 1-3 cm, axillary branches absent. Leaves: rosettes 1-2, not in clumps, 10-25-leaved, 3-12 cm diam.; blade pale green, oblong-lanceolate, tapering from base or slightly wider near middle, 3-15 × 0.5-2.5 cm, 1.5-6 mm thick, base 0.5-2.5 cm wide, apex narrowly acute, surfaces not farinose, glaucous at least when young. Inflorescences: cyme (red), 2-3-branched, obpyramidal; branches not twisted (flowers on topside), simple or 1 times bifurcate, (5-20 cm wide); cincinni 2-3, 2-20-flowered, circinate, 1-18 cm; floral shoots 5-40 × 0.2-0.9 cm; leaves 5-20, ascending, triangular-lanceolate, 5-70 × 3-10 mm, apex acute. Pedicels erect, not bent in fruit, 5-20 mm. Flowers: calyx 4-8 × 4.5-7 mm; petals connate 1-4 mm, bright to greenish yellow or red-marked, 8-20 × 9-20 mm, apex acute, tips often outcurved; pistils connivent, erect. Unripe follicles erect.

Subspecies 3 (3 in the flora): sw United States.

The three geographically isolated subspecies of Dudleya saxosa differ mostly in size of parts and in level of ploidy.


1 Floral shoots 5-20 cm; cincinni 2-9-flowered, 1-4 cm; caudices 1-1.5 cm diam.   12a Dudleya saxosa subsp. saxosa
+ Floral shoots (10-)15-40 cm; cincinni 4-20-flowered, 3-18 cm; caudices 1-3 cm diam   (2)
       
2 (1) Petals 8-12(-15) mm, usually bright yellow, if more than 12 mm, then greenish yellow.   12b Dudleya saxosa subsp. aloides
+ Petals 12-16(-20) mm, bright yellow, red- tinged.   12c Dudleya saxosa subsp. collomiae

Lower Taxa


 

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