Psilactis heterocarpa

(R. L. Hartman & M. A. Lane) D. R. Morgan

Syst. Bot. 18: 301. 1993.

EndemicConservation concern
Basionym: Machaeranthera heterocarpa R. L. Hartman & M. A. Lane Brittonia 39: 253, figs. 1, 2A, B, 3A. 1987
Treatment appears in FNA Volume 20. Treatment on page 463. Mentioned on page 462.

Annuals, 25–100 cm. Stems and branches finely appressed-hairy, stipitate-glandular distally. Distal leaf-blades sessile, lanceolate to linear-lanceolate, smallest 2–15 × 0.3–1.5 mm. Involucres broadly turbinate, 4–6 mm. Phyllaries lanceolate to linear, unequal, 2–4.5 × 0.5–0.7 mm, bases indurate, margins scarious. Receptacles flat to convex, 2–2.5 mm wide. Ray-florets 15–25; laminae 4–5 × 0.7–1.3 mm. Disc-florets 25–35; corollas 3–4 mm. Ray cypselae 1.3–1.5 mm, sparsely appressed-hairy. Disc cypselae 2–3 mm, glabrate or glabrous; pappi 25–40, 3.2–4 mm. 2n = 6.


Phenology: Flowering Sep–Nov.
Habitat: Grasslands, weedy pastures, open areas in Prosopis-Acacia woodlands
Elevation: 10–20 m

Discussion

Of conservation concern.

Psilactis heterocarpa is known from seven counties in the Gulf Coastal Plain of southern Texas.

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.

... more about "Psilactis heterocarpa"
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
David R. Morgan +
(R. L. Hartman & M. A. Lane) D. R. Morgan +
obovate +  and linear-oblanceolate +
decurrent +
indurate +
Machaeranthera heterocarpa +
compound +  and simple +
rugulose +  and muricate +
stipitate-glandular +  and appressed-hairy +
barbellulate +  and barbellate +
not 2-lipped +  and actinomorphic +
yellow +, white +  and blue or purple +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
beaked +, 2-ribbed +  and 5-ribbed +
compressed +, fusiform +  and clavate or obovoid +
fertile +  and bisexual +
white;tawny +
glabrous +  and glabrate +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
persistent +
fertile +  and bisexual +
unequal +
ovate;lanceolate +
0.2 cm2 mm <br />0.002 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
lanceolate;linear-lanceolate +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
10–20 m +
appressed-hairy +  and stipitate-glandular +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Grasslands, weedy pastures, open areas in Prosopis-Acacia woodlands +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
0.7mm;1.3mm +
cauline +  and basal +
deltate +  and lanceolate +
lobed +, toothed +  and entire +
2-carpellate +
25 cm250 mm <br />0.25 m <br /> (40 cm400 mm <br />0.4 m <br />) +
Flowering Sep–Nov. +
0.2 cm2 mm <br />0.002 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
lanceolate +  and linear +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
obovate +  and linear-oblanceolate +
appressed-hairy +
0.13 cm1.3 mm <br />0.0013 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
bearing subulate enations +, hairy +  and bristly +
pitted +  and verrucose +
flat;convex +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
exalbuminous +
Endemic +  and Conservation concern +
ascending +  and erect +
stipitate-glandular +  and appressed-hairy +
appendaged +  and truncate +
papillate +  and smooth +
Machaeranthera sect. Psilactis +
Psilactis heterocarpa +
Psilactis +
species +
25 cm250 mm <br />0.25 m <br /> (100 cm1,000 mm <br />1 m <br />) +
tree +, shrub +  and subshrub +
9 +, 4 +  and 3 +