Heterotheca fulcrata var. senilis

(Wooton & Standley) Semple

Brittonia 39: 380. 1987.

Basionyms: Chrysopsis senilis Wooton & Standley Contr. U.S. Natl. Herb. 16: 179. 1913
Treatment appears in FNA Volume 20. Treatment on page 244. Mentioned on page 241, 243, 245.

Stems moderately hispido-strigose, sparsely to moderately stipitate-glandular. Distal cauline leaf-blades ovate to lanceolate, 12–30 × 4–13 mm, margins sometimes ± undulate, with numerous long-hispido-strigose cilia, faces moderately hispido-strigose, moderately stipitate-glandular. Subtending bracts few, size sometimes nearly equaling distal leaves, sometimes much reduced and remote from heads, faces sparsely to moderately hispido-strigose, sparsely to moderately stipitate-glandular. Involucres 7.5–10 mm (averaging 8.5 mm). Phyllaries sparsely strigose, moderately to faces densely stipitate-glandular. Ray-floret laminae 9.5–14 mm (averaging 11.6 mm). Cypsela faces sparsely to moderately strigose. 2n = 18, 36.


Phenology: Flowering Jun–Oct.
Habitat: Rocky igneous and limestone soils, silty soils, margins of often seasonally dry streams, pinyon-juniper-oak and oak-pine-fir woodlands
Elevation: 700–2300 m

Distribution

V20-535-distribution-map.gif

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

Discussion

Variety senilis grows in southern New Mexico and trans-Pecos Texas; it is rare in southern Arizona and across northern Mexico. The most hispid form of the species, var. senilis, usually has numerous, spreading, large cilia along much or all of the leaf margins. The leaf margins are sometimes undulate, as in Heterotheca sessiliflora subsp. sessiliflora, and the two could be confused; the ranges do not overlap, however. The variety varies considerably in height and leaf size, and a number of collections are so reduced in size that they are easily mistaken for odd forms of H. villosa var. minor or H. viscida. Plants from southern Arizona often are similar to var. fulcrata. When hair density is high, leaf faces are obscured and the plants appear light grayish green; they could be confused with H. marginata.

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 +
(Wooton & Standley) Semple +
rounded +  and attenuate to somewhat +
Chrysopsis senilis +
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 /> (3 cm30 mm <br />0.03 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
proximal +  and subtending +
Ariz. +, N.Mex. +, Tex. +  and n Mexico +
700–2300 m +
stipitate-glandular +  and hispido-strigose +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Rocky igneous and limestone soils, silty soils, margins of often seasonally dry streams, pinyon-juniper-oak and oak-pine-fir 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 +
0.75 cm7.5 mm <br />0.0075 m <br /> (1 cm10 mm <br />0.01 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 +
undulate +
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 Jun–Oct. +
lanceolate +  and linear-lanceolate +
ovate-oblanceolate +
subpetiolate +  and sessile +
0.95 cm9.5 mm <br />0.0095 m <br /> (1.4 cm14 mm <br />0.014 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 +
appendaged +  and truncate +
papillate +  and smooth +
Ammodia +, Chrysopsis subg. Ammodia +  and Heterotheca sect. Ammodia +
Heterotheca fulcrata var. senilis +
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 +