Flora of North America species comparison

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Dudleya attenuata

Dudleya traskiae

Orcutt's dudleya, tapertip liveforever

Santa Barbara Island dudleya, Santa Barbara Island liveforever
Caudices

to 2 dm × 1–3 cm, clumps to 5 dm diam.
Leaves

without resinous odor;

rosette 25–40-leaved, 10–20 cm diam.;

blade light green, oblong to oblong-oblanceolate, flat, usually channelled adaxially, 4–15 × 1–4 cm, 2.5–6 mm thick, 4–6 times wider than thick, base 10–40 mm wide, surfaces mostly farinose, not viscid, not oily.
Inflorescences

cyme 2–3-branched, obpyramidal, (2–3 × 0.5–2 dm);

branches 1–2 times bifurcate (sometimes with some scattered proximally);

cincinni 7–20-flowered, somewhat circinate, 4–12 cm;

floral shoots 2–5 dm × 3–8 mm;

leaves 20–45, spreading to slightly ascending, triangular-ovate, 1–4 × 1–1.5 cm.
Pedicels

1–3 mm.
Flowers

petals ascending near base and outcurved, connate 1–2 mm, bright yellow, elliptic or narrowly ovate, 8–10.5 × 3–4 mm, apex acute, corolla 5–6 mm diam. at base and 8–15 mm at apex;

pistils suberect, 7–10 mm;

styles 2.5–4 mm.
California

Follicles

ascending, slightly gibbous adaxially, beaks ascending to spreading.
2n

= 68.

Dudleya attenuata

Dudleya traskiae
Phenology Flowering spring.
Habitat Sheer cliffs and rocky slopes
Elevation 0-100 m (0-300 ft)
Distribution
from FNA
CA; nw Mexico
[WildflowerSearch map]
[BONAP county map]
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
Discussion

Subspecies 2 (1 in the flora).

Subspecies australis Moran occurs in Baja California.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Of conservation concern.

Dudleya traskiae is endemic to Santa Barbara Island. It was once thought exterminated by feral rabbits (R. N. Philbrick 1972); the rabbits have been removed and the plants survive (R. V. Moran 1978), recovering on the slopes and in fact probably always secure on the sheer sea cliffs. According to R. Clark and W. L. Halvorson (1987), it is making a good recovery.

The campanulate corolla of Dudleya traskiae is intermediate between the prismatic or tubular corolla of subg. Dudleya and the open corolla more typical of subg. Stylophyllum and found in all the diploid species, including the most primitive. The corolla is much like those of hybrids between members of the two subgenera, and D. traskiae is tetraploid. These two facts together suggest that the species may have arisen as an amphidiploid hybrid (R. V. Moran 1978).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 8, p. 176. FNA vol. 8, p. 177.
Parent taxa Crassulaceae > Dudleya > subg. Stylophyllum Crassulaceae > Dudleya > subg. Stylophyllum
Sibling taxa
D. abramsii, D. arizonica, D. blochmaniae, D. brevifolia, D. candelabrum, D. cespitosa, D. cymosa, D. densiflora, D. edulis, D. farinosa, D. gnoma, D. greenei, D. lanceolata, D. multicaulis, D. nesiotica, D. palmeri, D. parva, D. pulverulenta, D. saxosa, D. stolonifera, D. traskiae, D. variegata, D. verityi, D. virens, D. viscida
D. abramsii, D. arizonica, D. attenuata, D. blochmaniae, D. brevifolia, D. candelabrum, D. cespitosa, D. cymosa, D. densiflora, D. edulis, D. farinosa, D. gnoma, D. greenei, D. lanceolata, D. multicaulis, D. nesiotica, D. palmeri, D. parva, D. pulverulenta, D. saxosa, D. stolonifera, D. variegata, D. verityi, D. virens, D. viscida
Subordinate taxa
D. attenuata subsp. attenuata
Synonyms Cotyledon attenuata, Stylophyllum attenuatum Stylophyllum traskiae, Echeveria traskiae
Name authority (S. Watson) Moran: Desert Pl. Life 14: 191. (1943) (Rose) Moran: Desert. Pl. Life 14: 153. 1942 (as traskae) ,
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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