Heterotheca fulcrata var. arizonica

Semple

Brittonia 39: 380, fig. 3. 1987.

Treatment appears in FNA Volume 20. Treatment on page 244. Mentioned on page 241, 243, 245.

Stems sparsely to moderate hispido-strigose, moderately stipitate-glandular. Distal cauline leaf-blades sessile, linear-ovate to linear-lanceolate, 12–22 × 3.8–8 mm, margins with few long-hispido-strigose cilia, faces sparsely to moderately hispido-strigose, moderately stipitate-glandular. Subtending bracts few, leaflike, not well differentiated from distalmost leaves and peduncle bracts. Involucres 5.7–8.4 mm. Phyllaries narrowly triangular-lanceolate, faces sparsely strigose, densely stipitate-glandular. Ray laminae usually 7.3–11 mm (averaging 9.6 mm). Cypsela faces sparsely strigose. 2n = 18.


Phenology: Flowering Jul–Oct(–Nov).
Habitat: Exposed, rocky embankments, cracks of rock outcrops, oak-pine woodlands
Elevation: 800–2400 m

Distribution

V20-534-distribution-map.gif

Ariz., Nev., N.Mex., Tex., Utah, n Mexico

Discussion

Variety arizonica grows in Arizona, southwestern New Mexico, southern Nevada, and is scattered in the mountains of trans-Pecos Texas (into Mexico). It is a low-elevation race of the species, distinguished by its small, usually linear-ovate to linear-lanceolate, more stipitate-glandular leaves. The leaflike bracts subtending the heads tend to be few and small. The variety is similar to xeric, more glandular forms of Heterotheca villosa var. scabra, and can be confused with less pedunculate individuals of H. viscida, especially in Texas, where plants of var. arizonica have indument features approaching var. senilis on the one hand and var. fulcrata on the other. In Texas, some plants of var. arizonica with long, linear-oblanceolate bracts subtending the heads and narrow leaves are similar in appearance to some H. stenophylla var. stenophylla. J. C. Semple (1996) noted the occurrence of an atypical plant from northcentral Utah (campground, Mount Nebo) that was probably introduced and ephemeral.

Selected References

None.

Lower Taxa

None.

"[" is not declared as a valid unit of measurement for this property."]" is not declared as a valid unit of measurement for this property.

not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
corymbiform +, open +  and compact +
indeterminate +  and determinate +
John C. Semple +
Semple +
rounded +  and attenuate to somewhat +
Chrysopsis fulcrata +
compound +  and simple +
3.4 cm34 mm <br />0.034 m <br /> (5.5 cm55 mm <br />0.055 m <br />) +
1 cm10 mm <br />0.01 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
1.2 cm12 mm <br />0.012 m <br /> (3.4 cm34 mm <br />0.034 m <br />) +
ovate;lanceolate +
reduced +  and larger +
4mm;15mm +
rugulose +  and muricate +
barbellulate +  and barbellate +
0.65 cm6.5 mm <br />0.0065 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
rhizomatous +  and taprooted +
long-hispido-strigose +
not 2-lipped +  and actinomorphic +
ampliate +
0.5 cm5 mm <br />0.005 m <br /> (0.75 cm7.5 mm <br />0.0075 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
compressed +  and obconic +
fertile +  and bisexual +
1.2 cm12 mm <br />0.012 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
0.38 cm3.8 mm <br />0.0038 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
proximal +  and subtending +
Ariz. +, Nev. +, N.Mex. +, Tex. +, Utah +  and n Mexico +
800–2400 m +
stipitate-glandular +, strigose +  and hispido-strigose +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Exposed, rocky embankments, cracks of rock outcrops, oak-pine woodlands +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
0.005 cm0.05 mm <br />5.0e-5 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
paniculiform +
in corymbiform arrays +  and singly +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
acute +  and weakly clavate +
tan;rusty brown +
attenuate +  and clavate +
0.9 cm9 mm <br />0.009 m <br /> (1.03 cm10.3 mm <br />0.0103 m <br />) +
cylindric;campanulate +
0.57 cm5.7 mm <br />0.0057 m <br /> (0.84 cm8.4 mm <br />0.0084 m <br />) +
1.3 cm13 mm <br />0.013 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
1mm;2.7mm +
sessile +  and petiolate +
cauline +  and basal +
erect;spreading +
lanceolate +, triangular +  and deltate +
hispido-strigose +
sinuate +  and entire to somewhat +
2-carpellate +
in 3 +  and 4 series +
stipitate-glandular +  and strigoso-canescent +
0.1 cm1 mm <br />0.001 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Flowering Jul–Oct(–Nov). +
triangular-lanceolate +
ovate-oblanceolate +
subpetiolate +  and sessile +
0.73 cm7.3 mm <br />0.0073 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
bearing subulate enations +, hairy +  and bristly +
subulate;convex +
10 +  and 12 +
3 +  and 40 +
linear +  and linear-lanceolate or triangular +
0.025 cm0.25 mm <br />2.5e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
exalbuminous +
ascending +  and erect +
1 +  and 30 +
moderate +
appendaged +  and truncate +
papillate +  and smooth +
Ammodia +, Chrysopsis subg. Ammodia +  and Heterotheca sect. Ammodia +
Heterotheca fulcrata var. arizonica +
Heterotheca fulcrata +
variety +
50 cm500 mm <br />0.5 m <br /> (80 cm800 mm <br />0.8 m <br />) +
17 cm170 mm <br />0.17 m <br /> (50 cm500 mm <br />0.5 m <br />) +
tree +, shrub +  and subshrub +