Xylorhiza orcuttii

(Vasey & Rose) Greene

Pittonia 3: 48. 1896.

Common names: Orcutt’s woody-aster
Basionym: Aster orcuttii Vasey & Rose Bot. Gaz. 16: 113. 1891
Synonyms: Machaeranthera orcuttii (Vasey & Rose) Cronquist & D. D. Keck
Treatment appears in FNA Volume 20. Treatment on page 407. Mentioned on page 406.

Shrubs, 50–150 cm. Stems branched to near apices, glabrous (younger stems and branchlets glabrous, eglandular). Leaf-blades spatulate to oblong or lanceolate, 5–26 mm wide, bases attenuate to cuneate or subauriculate-subclasping, margins flat, spinulose-dentate to subentire, faces glabrous or sericeous along veins. Peduncles 1–7 cm. Involucres 17–20 × 20–45 mm. Phyllaries tightly appressed, outermost glabrous, innermost equaling or longer than mid. Ray-florets (18–) 27–38 (–45); corollas light blue to lavender. Style-branch appendages shorter than stigmatic lines. 2n = 12.


Phenology: Flowering (Nov–)Jan–Apr(–Jun).
Habitat: Slopes and ravine bottoms, rocky sand and clay of high pH, in relatively barren areas dominated by creosote bush and cactus
Elevation: 20–300 m

Distribution

V20-929-distribution-map.gif

Calif., Mexico (Baja California)

Discussion

Of conservation concern.

Xylorhiza orcuttii grows in Imperial, Riverside, and San Diego counties.

Selected References

None.

Lower Taxa

None.
... more about "Xylorhiza orcuttii"
stipitate-glandular +, sparsely tomentose +  and villous +
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
spiciform +, racemiform +, paniculiform +  and corymbiform +
indeterminate +  and determinate +
Guy L. Nesom +
(Vasey & Rose) Greene +
subauriculate-subclasping +
attenuate +  and cuneate +
Aster orcuttii +
linear;lanceolate or oblanceolate oblong or narrowly elliptic +
rugulose +  and muricate +
Orcutt’s woody-aster +
not 2-lipped +  and actinomorphic +
light blue +  and lavender +
fusiform +  and linear or ovoid more or less compressed +
fertile +  and bisexual +
fertile +  and bisexual +
Calif. +  and Mexico (Baja California) +
20–300 m +
sericeous +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Slopes and ravine bottoms, rocky sand and clay of high pH, in relatively barren areas dominated by creosote bush and cactus +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
4 cm40 mm <br />0.04 m <br /> (4.8 cm48 mm <br />0.048 m <br />) +
1.7 cm17 mm <br />0.017 m <br /> (2 cm20 mm <br />0.02 m <br />) +
campanulate;hemispheric +
2 cm20 mm <br />0.02 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
spatulate;oblong or lanceolate +
subpetiolate +  and sessile +
triangular +
dentate-spinulose +  and entire +
spinulose-dentate +  and subentire +
2-carpellate +
persistent +
1 cm10 mm <br />0.01 m <br /> (7 cm70 mm <br />0.07 m <br />) +
Flowering (Nov–)Jan–Apr(–Jun). +
lanceolate +
bearing subulate enations +, hairy +  and bristly +
concave;usually flat;conic +
exalbuminous +
appendaged +  and truncate +
papillate +  and smooth +
Machaeranthera orcuttii +
Xylorhiza orcuttii +
Xylorhiza +
species +
shorter to longer +
80 cm800 mm <br />0.8 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +