Microseris howellii

A. Gray

Proc. Amer. Acad. Arts 20: 300. 1885.

Common names: Howell’s silverpuffs
EndemicConservation concern
Synonyms: Scorzonella howellii (A. Gray) Greene
Treatment appears in FNA Volume 19. Treatment on page 343. Mentioned on page 339, 342.

Perennials, 10–50 cm; taprooted. Stems branched proximally and often distally. Leaves basal and cauline; petiolate (petioles broadly winged, clasping); blades linear to narrowly oblanceolate, 10–30 cm, margins entire, dentate, or pinnately lobed (lobes narrow, often retrorse). Peduncles erect (10–50 cm), ebracteate or leafy. Involucres narrowly ovoid in fruit, 8–17 mm. Phyllaries: sometimes purple-spotted, apices erect, acuminate, abaxial faces glabrous or scurfy-puberulent, often black-villous; outer lanceolate to deltate; inner lanceolate. Florets 8–30; corollas yellow, surpassing phyllaries by 5+ mm. Cypselae columnar, 4–7 mm; pappi of 5–10, white, lanceolate, glabrous, aristate scales 3–6 mm, aristae barbellulate. 2n = 18.


Phenology: Flowering May–Jun.
Habitat: Rocky serpentine soils, hillsides and alluvial flats, open shrublands and Pinus jeffreyi savannas
Elevation: 300–1000 m

Discussion

Of conservation concern.

Microseris howellii is known only from exposures of peridotite in Josephine County, Oregon. Although related to M. laciniata, it is ecologically isolated from the co-occurring members of that complex. Because of its limited range, it is listed as a threatened taxon by the Oregon Natural Heritage Program (2004).

Selected References

None.

Lower Taxa

None.

"fine" is not a number.

... more about "Microseris howellii"
black-villous +, scurfy-puberulent +  and glabrous +
scarious +
ovate +  and lanceolate +
paniculiform +  and corymbiform +
indeterminate +  and determinate +
Kenton L. Chambers +
A. Gray +
decurrent +
compound +  and simple +
linear;narrowly oblanceolate +
10 cm100 mm <br />0.1 m <br /> (30 cm300 mm <br />0.3 m <br />) +
tuberculate +, rugose +, muricate +  and smooth +
filiform +
Howell’s silverpuffs +
zygomorphic +, actinomorphic +  and (3-)5-merous +
purplish-spotted +, gray +  and brown or purplish +
300–1000 m +
villous +  and glabrous +
winged +  and beaked +
dispersed +
Rocky serpentine soils, hillsides and alluvial flats, open shrublands and Pinus jeffreyi savannas +
indeterminate +
each +  and sessile +
0.3 cm3 mm <br />0.003 m <br /> (3 cm30 mm <br />0.03 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
cauline +  and basal +
lobed +  and dentate +
lanceolate +  and deltate +
2-carpellate +
persistent +
leafy +  and ebracteate +
Flowering May–Jun. +
connate +  and distinct +
5 +  and 40 +
Proc. Amer. Acad. Arts +
flat;low-convex +
10 +  and 15 +
linear +, orbiculate +, ovate +, oblong +, lanceolate +  and deltate +
5 +  and 10 +
aristate +  and lanceolate +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
exalbuminous +
Endemic +  and Conservation concern +
few +, 1 +  and 30 +
appendaged +  and truncate +
papillate +
Scorzonella howellii +
Microseris howellii +
Microseris +
species +
10 cm100 mm <br />0.1 m <br /> (50 cm500 mm <br />0.5 m <br />) +
shrub +  and subshrub +