Xylorhiza wrightii

(A. Gray) Greene

Pittonia 3: 47. 1896.

Common names: Big Bend woody-aster
Illustrated
Basionym: Aster wrightii A. Gray Smithsonian Contr. Knowl. 5(6): 75. 1853
Synonyms: Machaeranthera wrightii (A. Gray) Cronquist & D. D. Keck
Treatment appears in FNA Volume 20. Treatment on page 409. Mentioned on page 407.

Subshrubs or perennials, (15–) 20–40 (–54) cm. Stems branched mostly in proximal 3/4, glabrous, densely stipitate-glandular. Leaf-blades spatulate to obovate or oblong, rarely elliptic, 5–24 mm wide, bases attenuate, not clasping, margins flat, toothed to entire (densely short-ciliate), faces densely stipitate-glandular, otherwise glabrous. Peduncles 5–10 cm. Involucres (20–) 25–35 (–40) × (20–) 28–40 (–48) mm. Ray-florets (18–) 24–32 (–34); corollas usually light blue to purple, rarely white. Style-branch appendages equaling or shorter than stigmatic lines. 2n = 12.


Phenology: Flowering Mar–May.
Habitat: Barren areas, alkaline, rocky-clay soil, gypsum or limestone flats, shaly slopes, rocky hills, dominated by saltbush, creosote bush, catclaw, and yucca
Elevation: 700–1100 m

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Xylorhiza wrightii"
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 +
(A. Gray) Greene +
attenuate +
Aster wrightii +
linear;lanceolate or oblanceolate oblong or narrowly elliptic +
rugulose +  and muricate +
Big Bend woody-aster +
not 2-lipped +  and actinomorphic +
white +, usually light blue +  and purple +
fusiform +  and linear or ovoid more or less compressed +
fertile +  and bisexual +
fertile +  and bisexual +
Tex. +  and Mexico (Chihuahua) +
700–1100 m +
glabrous +  and stipitate-glandular +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Barren areas, alkaline, rocky-clay soil, gypsum or limestone flats, shaly slopes, rocky hills, dominated by saltbush, creosote bush, catclaw, and yucca +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
3.5 cm35 mm <br />0.035 m <br /> (4 cm40 mm <br />0.04 m <br />) +
4 cm40 mm <br />0.04 m <br /> (4.8 cm48 mm <br />0.048 m <br />) +
2.5 cm25 mm <br />0.025 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
campanulate;hemispheric +
2.8 cm28 mm <br />0.028 m <br /> (4 cm40 mm <br />0.04 m <br />) +
spatulate;obovate or oblong +
subpetiolate +  and sessile +
triangular +
dentate-spinulose +  and entire +
toothed +  and entire +
2-carpellate +
persistent +
5 cm50 mm <br />0.05 m <br /> (10 cm100 mm <br />0.1 m <br />) +
Flowering Mar–May. +
lanceolate +
bearing subulate enations +, hairy +  and bristly +
concave;usually flat;conic +
exalbuminous +
Illustrated +
stipitate-glandular +  and glabrous +
appendaged +  and truncate +
papillate +  and smooth +
Machaeranthera wrightii +
Xylorhiza wrightii +
Xylorhiza +
species +
shorter to longer +
40 cm400 mm <br />0.4 m <br /> (54 cm540 mm <br />0.54 m <br />) +
20 cm200 mm <br />0.2 m <br /> (40 cm400 mm <br />0.4 m <br />) +
40 cm400 mm <br />0.4 m <br /> (54 cm540 mm <br />0.54 m <br />) +