SAXOSA ssp. COLLOMIAE (Rose ex Morton) Moran, 1957

Synonyms :

Dudleya collomiae  Rose ex Morton (1934) / Dudleya saxosa var. collomiae  (Rose ex Morton) hort. (s.a.) / Echeveria collomiae  (Rose ex Morton) Keamey &Peebles (1939)

Distribution : USA (central Arizona); 600 - 1800 m. 1: Thomson (1993: pl. 19: 1).

Differs from ssp. saxosa:

Stems 1.5 - 3 cm in diameter.

Rosettes with 12 - 20 leaves.

Leaves 6 - 15 x 1 - 2 (-2.5) (basally 1 - 2.5) cm.

Inflorescence : Scape 15 - 40 cm, scorpioid branches 3 – 12 cm, with 4 - 12 flowers.

Flowers : Calyx 5 - 8 mm, sepals 4 - 7 mm, petals 12 - 18 (-20) x 3 - 4 mm, usually bright yellow, tube 1 - 4 mm.

Cytology : n = 68

Apart from D. pulverulenta ssp. arizonica, this is the only taxon of Dudleya occurring in Arizona.