Chrysothamnus molestus

(S. F. Blake) L. C. Anderson

Madroño 17: 222. 1964.

Common names: Arizona rabbitbrush
IllustratedEndemic
Basionym: Chrysothamnus viscidiflorus var. molestus S. F. Blake J. Wash. Acad. Sci. 30: 468. 1940
Treatment appears in FNA Volume 20. Treatment on page 190. Mentioned on page 101, 188.

Shrubs, 8–20 cm; with woody, highly branched caudices, bark dark gray, highly fibrous with age. Stems ascending, green, ± puberulent, stipitate-glandular. Leaves erect to closely ascending; sessile; blades with ± evident midnerves, linear to narrowly elliptic, 7–20 × 0.7–1.5 mm, sulcate, sometimes apiculate, apices acute, faces moderately puberulent, uniformly stipitate-glandular. Heads in small cymiform to racemiform arrays. Involucres subcylindric, 9–11 × 2.5–3.5 mm. Phyllaries ± 20 in 4–5 series, in 4–5 strong vertical ranks, tan, often with green or dark subapical splotch, midnerves often obscure, linear or lanceolate to elliptic, 2–9 × 0.5–1.3 mm, unequal, outer ± herbaceous, inner chartaceous, strongly keeled, apices acute to rounded, tip cupped, faces of outer glabrous or puberulent. Disc-florets 5; corollas 5.5–7.5 mm, lobes 0.9–1.5 mm; style-branches 2.7–3.2 mm, appendages 1–1.7 mm. Cypselae tan, elliptic, 4.2–6 mm, mostly 5-ribbed, faces glabrous, sparsely glandular; pappi tan, 6–7.5 mm. 2n = 18.


Phenology: Flowering late summer–fall.
Habitat: Rocky soils, mostly on limestone pinyon-juniper woodland
Elevation: 1800–2400 m

Discussion

Chrysothamnus molestus is known only from Coconino County. It is in the Center for Plant Conservation’s National Collection of Endangered Plants.

Selected References

None.

Lower Taxa

None.
... more about "Chrysothamnus molestus"
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
cymiform +  and racemiform +
indeterminate +  and determinate +
Lowell E. Urbatsch +, Roland P. Roberts +  and Kurt M. Neubig +
(S. F. Blake) L. C. Anderson +
decurrent +
Chrysothamnus viscidiflorus var. molestus +
linear +  and narrowly elliptic +
0.7 cm7 mm <br />0.007 m <br /> (2 cm20 mm <br />0.02 m <br />) +
obovate;elliptic;obovate;elliptic;lanceolate;filiform +
0.7mm;1.5mm +
rugulose +  and muricate +
barbellulate +  and barbellate +
Arizona rabbitbrush +
not 2-lipped +  and actinomorphic +
0.55 cm5.5 mm <br />0.0055 m <br /> (0.75 cm7.5 mm <br />0.0075 m <br />) +
less flattened +  and 4-5-angled +
fertile +  and bisexual +
1800–2400 m +
resinous +
gland-dotted +
glabrous +, puberulent +  and stipitate-glandular +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Rocky soils, mostly on limestone pinyon-juniper woodland +
in condensed cymiform clusters +  and singly +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.9 cm9 mm <br />0.009 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
subcylindric +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
erect;spreading +
triangular +  and lanceolate +
hirtellous +  and ciliate +
2mm +  and 9mm +
obscure +  and evident +
lanceolate +  and elliptic +
0.5mm +  and 1.3mm +
2-carpellate +
persistent +
0.6 cm6 mm <br />0.006 m <br /> (0.75 cm7.5 mm <br />0.0075 m <br />) +
Flowering late summer–fall. +
lanceolate +  and ovate or obovate +
4 +  and 5 +
styliferous +, neuter +  and pistillate +
bearing subulate enations +, hairy +  and bristly +
exalbuminous +
Illustrated +  and Endemic +
resinous +
appendaged +  and truncate +
papillate +  and smooth +
Vanclevea +
Chrysothamnus molestus +
Chrysothamnus +
species +
campanulate +
perennial +, biennial +  and annual +