Xanthisma spinulosum var. chihuahuanum

(B. L. Turner & R. L. Hartman) D. R. Morgan & R. L. Hartman

Sida 20: 1408. 2003.

Basionym: Machaeranthera pinnatifida var. chihuahuana B. L. Turner & R. L. Hartman Wrightia 5: 311. 1976
Synonyms: Haplopappus spinulosus var. chihuahuanus (B. L. Turner & R. L. Hartman) Gandhi
Treatment appears in FNA Volume 20. Treatment on page 392. Mentioned on page 391.

Perennials, 30–50 cm, often woody at base. Stems stiffly erect, usually much branched in proximal 1/2–2/3; mid internodes 2–5 mm. Leaves numerous, concentrated in proximal ± 1/2, spreading to loosely ascending, often much reduced distally, margins of proximal pinnatifid to 2-pinnatifid, of distal coarsely dentate to ± entire, lobes linear to lanceolate, 3–5 mm, faces usually hairy, rarely glabrous, often densely stipitate-glandular. Heads 2–10+ in diffuse arrays. Peduncles relatively terminal and lateral, 0.5–2 cm. Involucres 12–15 mm wide. 2n = 8, 16.


Phenology: Flowering spring–fall.
Habitat: Clayey to rocky washes, prairies, plains, roadsides
Elevation: 1000–1800 m

Distribution

V20-891-distribution-map.gif

Ariz., N.Mex., Tex., Mexico (Chihuahua), Mexico (Coahuila), Mexico (Durango), Mexico (Sonora)

Discussion

Variety chihuahuanum is a Chihuahuan Desert taxon that extends into the southern United States.

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 +
(B. L. Turner & R. L. Hartman) D. R. Morgan & R. L. Hartman +
decurrent +
indurate +
Machaeranthera pinnatifida var. chihuahuana +
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 />) +
Ariz. +, N.Mex. +, Tex. +, Mexico (Chihuahua) +, Mexico (Coahuila) +, Mexico (Durango) +  and Mexico (Sonora) +
1000–1800 m +
stipitate-glandular +, glabrous +  and hairy +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Clayey to rocky washes, prairies, plains, 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 +
1.2 cm12 mm <br />0.012 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 +
linear +  and lanceolate +
entire +  and dentate +
pinnatifid +  and 2-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 var. chihuahuanus +
Xanthisma spinulosum var. chihuahuanum +
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 />) +
30 cm300 mm <br />0.3 m <br /> (50 cm500 mm <br />0.5 m <br />) +
4 +, 3 +  and [2 +