Arida blepharophylla

(A. Gray) D. R. Morgan & R. L. Hartman

Sida 20: 1413. 2003.

Common names: Gypsum tansy-aster
Basionyms: Aster blepharophyllus A. Gray Smithsonian Contr. Knowl. 5(6): 77. 1853 Machaeranthera gypsitherma G. L. Nesom Vorobik & R. L. Hartman
Treatment appears in FNA Volume 20. Treatment on page 403. Mentioned on page 402.

Perennials, 4–35 cm; rhizomes shallow, spreading (forming vegetative rosettes), roots fibrous. Stems 6–12+, erect or stiffly ascending, slender, sparingly branched distally, glabrous. Leaves basal and cauline; sessile, clasping; basal blades linear-oblanceolate, abruptly reduced distally, 10–40 × 1.5–3 mm (succulent), margins entire with 8–20 cilia per side (cilia 0.4–1.5 mm), apices acute (bristly-tipped), faces glabrous, glaucous. Heads borne singly (terminal), often in corymbiform arrays. Involucres broadly turbinate, 7–10 × 5–8 mm (fresh). Phyllaries in 4–6 series, appressed, oblong to oblanceolate or obovate, 1–4 mm, bases whitish, midnerves dark, margins laciniate-ciliate, apices green, broadly acute or short-acuminate, faces glabrous. Ray-florets 8–12+; laminae blue, 8–10 mm, coiling after flowering. Disc-florets 12–18+; corollas yellow or sometimes purple-tinged, 4.5–5.5 mm. Cypselae narrowly oblong-oblanceolate, 1.7–2.4 mm, nerves 8–11 per face, faces sericeous; pappi tawny, setose; ray 1.5–2 mm; disc 3.5–4 mm. 2n = 10.


Phenology: Flowering Sep–Oct.
Habitat: Limestone areas, mountains
Elevation: 1500–2200 m

Distribution

V20-922-distribution-map.gif

N.Mex., Tex., Mexico (Chihuahua)

Discussion

Arida blepharophylla is recognized by its perennial habit and leaves with long cilia on the margins. The perennial habit and branching caudex are similar to Xanthisma sect. Blepharodon. Within Arida, A. blepharophylla appears to be closely related to A. riparia, and the two species probably hybridize.

The type collection was made by Charles Wright in 1851 in present-day New Mexico and originally named Aster blepharophyllus. The species was not rediscovered until 1971 in Chihuahua, Mexico, in an area of gypsic hot springs. When transferred to Machaeranthera, it was given the name M. gypsitherma because the original epithet is blocked in that genus by the earlier, heterotypic M. blephariphylla (A. Gray) Shinners.

Lower Taxa

None.

... more about "Arida blepharophylla"
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
Ronald L. Hartman +  and David J. Bogler +
(A. Gray) D. R. Morgan & R. L. Hartman +
1 cm10 mm <br />0.01 m <br /> (4 cm40 mm <br />0.04 m <br />) +
linear-oblanceolate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
decurrent +
indurate to herbaceous +
Aster blepharophyllus +  and Machaeranthera gypsitherma +
compound +  and simple +
rugulose +  and muricate +
barbellulate +  and barbellate +
attenuate +
lanceolate +  and scalelike +
8 (?) +  and 20 (?) +
Gypsum tansy-aster +
not 2-lipped +  and actinomorphic +
purple-tinged +  and yellow +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
beaked +, 2-ribbed +  and 5-ribbed +
oblong-oblanceolate +
fertile +  and bisexual +
fertile +  and bisexual +
equaling +
compressed +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
N.Mex. +, Tex. +  and Mexico (Chihuahua) +
1500–2200 m +
sericeous +, glabrous +  and glaucous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Limestone areas, mountains +
discoid +  and radiate +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.7 cm7 mm <br />0.007 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
cauline +  and basal +
triangular +
lacerate +  and deeply pinnatifid or 2-pinnatifid +
2-carpellate +
persistent +
Flowering Sep–Oct. +
reflexed +, spreading +  and appressed +
oblong +  and oblanceolate or obovate +
0.1 cm1 mm <br />0.001 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
bearing subulate enations +, hairy +  and bristly +
nesom1990j +
exalbuminous +
gland-dotted +
ascending +  and erect +
6 +  and 12 +
slender +
appendaged +  and truncate +
papillate +  and smooth +
Compositae +
Arida blepharophylla +
species +
1/4-1/2 times funnelform throats +
rhizomatous +  and taprooted +
60 cm600 mm <br />0.6 m <br /> (90 cm900 mm <br />0.9 m <br />) +
4 cm40 mm <br />0.04 m <br /> (35 cm350 mm <br />0.35 m <br />) +