Stebbinsoseris decipiens

(K. L. Chambers) K. L. Chambers

Amer. J. Bot. 78: 1025. 1991.

Common names: Santa Cruz silverpuffs
Endemic
Basionym: Microseris decipiens K. L. Chambers Contr. Dudley Herb. 4: 290, fig. 17. 1955
Treatment appears in FNA Volume 19. Treatment on page 347.

Peduncles 15–60 cm. Involucres 6–19 mm. Florets 10–80 (–100); corollas yellow. Cypselae brown to purplish, narrowly truncate-fusiform, 5–8 mm, each filled by embryo or no more than distal 0.5 mm vacant, apices not enlarged at bases of pappi; pappi 7–10 mm, scale bodies 3–5 mm, faces glabrous, aristae 4–5 mm. 2n = 36.


Phenology: Flowering Apr–May.
Habitat: Sandy, shale, or serpentine soils, grasslands, coastal scrub, chaparral, closed-cone pine woods, roadsides
Elevation: 10–500 m

Discussion

Of conservation concern.

Morphologic and molecular evidence (K. L. Chambers 1955; C. Irmler et al. 1982; R. S. Wallace and R. K. Jansen 1990) proves that Stebbinsoseris decipiens is an allopolyploid derivative of the hybrid Microseris bigelovii × Uropappus lindleyi. It occurs in a limited area of central coastal California where the parental taxa are sympatric. Diploid hybrids between the parents, produced experimentally (Chambers), had irregular meiosis and were completely seed-sterile. The species is included in Inventory of Rare and Endangered Plants of California, ed. 6 (D. P. Tibor 2001).

Lower Taxa

None.

"fine" is not a number.

... more about "Stebbinsoseris decipiens"
not enlarged +
scarious +
ovate +  and lanceolate +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
paniculiform +  and corymbiform +
indeterminate +  and determinate +
Kenton L. Chambers +
(K. L. Chambers) K. L. Chambers +
decurrent +
Microseris decipiens +
compound +  and simple +
linear;narrowly oblanceolate +
tuberculate +, rugose +, muricate +  and smooth +
ovate;lanceolate +
filiform +
Santa Cruz silverpuffs +
zygomorphic +, actinomorphic +  and (3-)5-merous +
brown +  and purplish +
truncate-fusiform +
10–500 m +
winged +  and beaked +
dispersed +
Sandy, shale, or serpentine soils, grasslands, coastal scrub, chaparral, closed-cone pine woods, roadsides +
indeterminate +
each +  and sessile +
0.5 cm5 mm <br />0.005 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
campanulate +
0.6 cm6 mm <br />0.006 m <br /> (1.9 cm19 mm <br />0.019 m <br />) +
cauline +  and basal +
irregularly dentate or lobed +  and entire +
divided +, lobed +  and dentate +
2-carpellate +
white +, brownish +  and yellowish +
persistent +
0.7 cm7 mm <br />0.007 m <br /> (1 cm10 mm <br />0.01 m <br />) +
15 cm150 mm <br />0.15 m <br /> (60 cm600 mm <br />0.6 m <br />) +
Flowering Apr–May. +
connate +  and distinct +
5 +  and 18 +
Amer. J. Bot. +
flat;convex +
irmler1982a +
spiculate +  and scabrellous +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
aristate +
exalbuminous +
appendaged +  and truncate +
papillate +
Microseris sect. Brachycarpa +  and Uropappus sect. Brachycarpa +
Stebbinsoseris decipiens +
Stebbinsoseris +
species +
1 cm10 mm <br />0.01 m <br /> (10 cm100 mm <br />0.1 m <br />) +
shrub +  and subshrub +