Arida mattturneri

B. L. Turner & G. L. Nesom

Sida 20: 1418, fig. 1, 2. 2003.

Treatment appears in FNA Volume 20. Treatment on page 404. Mentioned on page 402, 405.

Annuals or short-lived perennials, 50–80 cm (bushy); taproots moderately thick, woody. Stems 10–40+, erect to ascending, slender, repeatedly branched, midstems glabrous or sparsely gland-dotted, often stipitate-glandular and sticky-viscid. Leaves basal (rosettes) and cauline; sessile; basal blades obovate, 40–60 × 1.5–3.5 mm, greatly reduced distally, bases broadened, margins 2-pinnatifid, faces stipitate-glandular; distal margins entire or toothed, apices apiculate. Heads 10–13 (terminal) in loose, corymbiform arrays. Involucres campanulate, 5–6 × 6–8 mm (fresh). Phyllaries in 5–6 series, spreading to recurved distally, oblong-lanceolate, 1–6 mm, bases green, margins ± entire, apices green, rounded-acute, faces stipitate-glandular. Ray-florets 9–13+; laminae lavender, 10.5–11.5 mm, drooping in flower, coiling after flowering. Disc-florets 40–100+; corollas yellow, 3.5–4.5 mm. Cypselae obovoid-oblong, 1–1.5 mm, 8–12-nerved per face, faces densely sericeous; pappi: ray 0; disc white, setose, 3–4 mm. 2n = 10.


Phenology: Flowering Apr–Jul.
Habitat: Sulphur streams, tinajas
Elevation: 1400–1500 m

Discussion

Of conservation concern.

Arida mattturneri is recognized by its basal rosettes of 2-pinnatifid leaves, dense glandular pubescence on stems, leaves, and phyllaries, lavender ray florets, and epappose ray cypselae. The type locality is Blumberg Canyon, Presidio County. Turner and Nesom suggested that A. mattturneri may be related to A. turneri, which also has 2-pinnatifid proximal leaves, or to A. parviflora, which is perennial and sometimes also has epappose ray cypselae but smaller heads.

Selected References

None.

Lower Taxa

None.
... more about "Arida mattturneri"
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 +
B. L. Turner & G. L. Nesom +
4 cm40 mm <br />0.04 m <br /> (6 cm60 mm <br />0.06 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
decurrent +
indurate to herbaceous +
broadened +
Machaeranthera sect. Arida +
compound +  and simple +
rugulose +  and muricate +
barbellulate +  and barbellate +
lanceolate +  and scalelike +
not 2-lipped +  and actinomorphic +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
beaked +, 2-ribbed +  and 5-ribbed +
obovoid-oblong +
fertile +  and bisexual +
fertile +  and bisexual +
equaling +
compressed +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
toothed +  and entire +
1400–1500 m +
sericeous +  and stipitate-glandular +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Sulphur streams, tinajas +
discoid +  and radiate +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
campanulate +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
1.05 cm10.5 mm <br />0.0105 m <br /> (1.15 cm11.5 mm <br />0.0115 m <br />) +
cauline +  and basal +
triangular +
2-pinnatifid +
sticky-viscid +
gland-dotted +
stipitate-glandular;glabrous +
2-carpellate +
whitish +  and white +
persistent +
Flowering Apr–Jul. +
spreading +  and recurved +
oblong-lanceolate +
0.1 cm1 mm <br />0.001 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
bearing subulate enations +, hairy +  and bristly +
exalbuminous +
gland-dotted +
erect +  and ascending +
10 +  and 40 +
slender +
appendaged +  and truncate +
papillate +  and smooth +
Compositae +
Arida mattturneri +
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 />) +
perennial +, short-lived +  and annual +
50 cm500 mm <br />0.5 m <br /> (80 cm800 mm <br />0.8 m <br />) +