Dudleya abramsii subsp. setchellii

(Jepson) Moran

J. Bot. Res. Inst. Texas 1: 1015. 2007 ,.

Common names: Santa Clara Valley dudleya
Basionym: Cotyledon laxa var. setchellii Jepson Fl. W. Calif., 267. 1901
Synonyms: Dudleya cymosa subsp. setchellii (Jepson) Moran Dudleya setchellii (Jepson) Britton & Rose
Treatment appears in FNA Volume 8. Treatment on page 184. Mentioned on page 183, 185.

Caudices 2–5-branched, 1–2 cm diam. Leaves: rosettes 1–5; blade oblong-lanceolate or tapering from base, semiterete, 3–8 × 0.5–1 cm. Inflorescences: floral shoots 5–20 × 0.2–0.4 cm; proximalmost leaf-blades 10–30 mm; branches 2–3, simple. Pedicels 1–5 mm. Flowers: calyx 4–5 × 2–5 mm; petals connate 1–1.5 mm, unmarked pale-yellow, almost white, not red-lineolate, 7–12 × 2–3 mm, tips erect. 2n = 34.


Phenology: Flowering spring.
Habitat: Rocky outcrops in serpentine grassland
Elevation: 100-300 m

Discussion

Of conservation concern.

Subspecies setchellii is known from the Coyote Valley area, Santa Clara County; it is considered seriously threatened (California Native Plant Society, http://cnps.web.aplus.net/cgi-bin/inv/inventory.cgi). Although placed formerly with Dudleya cymosa, it is clearly closer to D. abramsii and especially to subsp. murina, which also grows on serpentine and at about the same elevation but some 200 kilometers to the south. Subspecies setchellii tends to be smaller, with petals unmarked and less sharply acute.

Selected References

None.

Lower Taxa

None.
perigynous +  and hypogynous +
acute +  and subacuminate +
Reid V. Moran +
(Jepson) Moran +
0.5cm +  and 1.5cm +
Cotyledon laxa var. setchellii +
elliptic or oblong to oblong-lanceolate or tapering +  and linear +
3 cm30 mm <br />0.03 m <br /> (8 cm80 mm <br />0.08 m <br />) +
lobed +  and toothed +
semiterete +, tapering +  and oblong-lanceolate +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
bifurcate +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
elongate +
whorled +, opposite +  and alternate +
2-10(-18)-flowered +
3 cm30 mm <br />0.03 m <br /> (15 cm150 mm <br />0.15 m <br />) +
Santa Clara Valley dudleya +
5-gonal +  and tubular +
1-4-branched +
obpyramidal +
100-300 m +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
branched +  and simple +
erect;pendent +
erect;spreading +
Rocky outcrops in serpentine grassland +
axillary +  and terminal +
sessile +, petiolate +  and subclasping +
alternate +  and crowded +
persistent +
0.4 cm4 mm <br />0.004 m <br /> (4 cm40 mm <br />0.04 m <br />) +
triangular-lanceolate +
0.2 cm2 mm <br />0.002 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
usually connivent;adjacent +
wider than tall +
semi-inferior +  and superior +
tenuinucellate +, crassinucellate +  and bitegmic +
0.5 cm5 mm <br />0.005 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
perigynous +  and hypogynous +
1.6 cm16 mm <br />0.016 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
white +  and unmarked pale-yellow +
7mm;12mm +
ascending +  and erect +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Flowering spring. +
(3-)4-5(-12)[-30+]-carpellate +
not gibbous +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
J. Bot. Res. Inst. Texas +
not 10-20(-30)-leaved +
cross-ribbed +  and ribbed +
1 +  and many +
adnate +  and free +
antipetalous +
2-branched +  and simple +
distinct +
glaucous +  and not farinose +
Dudleya cymosa subsp. setchellii +  and Dudleya setchellii +
Dudleya abramsii subsp. setchellii +
Dudleya abramsii +
subspecies +
cylindric +  and 5-gonal +
perennial +, biennial +  and annual +