Xanthisma spinulosum var. glaberrimum

(Rydberg) D. R. Morgan & R. L. Hartman

Sida 20: 1408. 2003.

Basionym: Sideranthus glaberrimus Rydberg Bull. Torrey Bot. Club 27: 621. 1900
Synonyms: Haplopappus spinulosus subsp. glaberrimus (Rydberg) H. M. Hall Haplopappus spinulosus var. glaberrimus (Rydberg) S. F. Blake Machaeranthera pinnatifida var. glaberrima (Rydberg) B. L. Turner & R. L. Hartman Xanthisma glaberrimum
Treatment appears in FNA Volume 20. Treatment on page 392. Mentioned on page 391.

Perennials, 20–50 cm, often woody at base. Stems stiffly erect, branched in distal 1/3; mid internodes 2–5 mm. Leaves numerous, strictly ascending, not reduced distally, margins pinnatifid, lobes oblong-lanceolate to triangular, 2–7 mm, faces usually glabrous, sometimes lightly tomentose, eglandular. Heads 2–10+, (subsesssile) usually clustered. Peduncles relatively terminal and lateral, 0.5–2 cm. Involucres 8–15 mm wide. 2n = 8, 16.


Phenology: Flowering spring–fall.
Habitat: Sandy to gravelly prairies, hillsides, and roadsides
Elevation: 800–1400 m

Distribution

V20-892-distribution-map.gif

Colo., Iowa, Kans., Nebr., N.Mex., N.Dak., Okla., Tex., Wyo.

Discussion

G. L. Nesom (2003) recognized Xanthisma spinulosum var. glaberrium at species level, as it occurs sympatrically with variety spinulosum in the Texas panhandle, where the two taxa behave like biological species; on the eastern plains of Colorado, however, hybridization and autoploidy have been documented (D. P. Hauber 1986).

Selected References

None.

Lower Taxa

None.

"spreading" is not a number.

not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
Ronald L. Hartman +
(Rydberg) D. R. Morgan & R. L. Hartman +
decurrent +
indurate +
Sideranthus glaberrimus +
0.2 cm2 mm <br />0.002 m <br /> (8 cm80 mm <br />0.08 m <br />) +
oblong;lanceolate +
reduced +
0.1cm;3cm +
rugulose +  and muricate +
barbellulate +  and barbellate +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
not 2-lipped +  and actinomorphic +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
fertile +  and bisexual +
fertile +  and bisexual +
flattened +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.32 cm3.2 mm <br />0.0032 m <br />) +
Colo. +, Iowa +, Kans. +, Nebr. +, N.Mex. +, N.Dak. +, Okla. +, Tex. +  and Wyo. +
800–1400 m +
tomentose +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Sandy to gravelly prairies, hillsides, and roadsides +
discoid +  and radiate +
in corymbiform arrays +  and singly +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.6 cm6 mm <br />0.006 m <br /> (1 cm10 mm <br />0.01 m <br />) +
hemispheric;cupulate +
0.8 cm8 mm <br />0.008 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
ovate +  and orbiculate or depressed-elliptic +
unequal +
1mm;2.5mm +
serrate +  and entire +
sessile +  and short-petiolate +
cauline +  and basal +
reduced +
bristle-tipped +
oblong-lanceolate +  and triangular +
entire +  and dentate +
pinnatifid +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
2-carpellate +
persistent +
30 +  and 90 +
flattened +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
stipitate-glandular +, hairy +  and glabrous +
0.5 cm5 mm <br />0.005 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Flowering spring–fall. +
light green +  and stramineous +
appressed +  and squarrose +
linear +  and linear-lanceolate +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
connate +  and distinct +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
connate +  and distinct +
laciniate +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
connate +  and distinct +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
bearing subulate enations +, hairy +  and bristly +
flat;convex +
exalbuminous +
unequal +
1 +  and 30 +
green patch +
expanded +
appendaged +  and truncate +
papillate +  and smooth +
Haplopappus spinulosus subsp. glaberrimus +, Haplopappus spinulosus var. glaberrimus +, Machaeranthera pinnatifida var. glaberrima +  and Xanthisma glaberrimum +
Xanthisma spinulosum var. glaberrimum +
Xanthisma spinulosum +
variety +
stipitate-glandular +, glabrous +  and hairy +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.32 cm3.2 mm <br />0.0032 m <br />) +
20 cm200 mm <br />0.2 m <br /> (50 cm500 mm <br />0.5 m <br />) +
4 +, 3 +  and [2 +