Helianthus praecox subsp. hirtus
Mem. Torrey Bot. Club 22(3): 54. 1969.
Common names: Dimmit sunflower
EndemicConservation concern
Basionym: Helianthus debilis subsp. hirtus Heiser Madroño 13: 162, fig. 7. 1956
Treatment appears in FNA Volume 21. Treatment on page 152.
Stems erect, branches ascending, densely hirsute or hispid-hirsute. Leaves (larger) 8–9 cm. Peduncles (25–) 30–40 cm. Phyllary apices short-attenuate. Paleae: middle teeth white-villous (“bearded”). Rays 14–16.2n = 34.
Phenology: Flowering early summer–fall.
Habitat: Sandy soils
Elevation: 50–100+ m
Discussion
Of conservation concern.
Subspecies hirtus is known from only a single population, near Carrizo Springs; it is genetically distinct from the two other subspecies (L. H. Rieseberg and M. F. Doyle 1989)
Selected References
None.
Lower Taxa
None.
... more about "Helianthus praecox subsp. hirtus"
dark +
introrse +
connate +
herbaceous +
short-attenuate;short-acuminate +
scarious +
absent +
purplish red +
hirsute +
papillate +
continuous +
truncate +
3-nerved +
deltate;ovate +
winged;ribbed;winged;ribbed +
1;15 +
ascending +
stigmatic +
absent +
Dimmit sunflower +
zygomorphic +
monomorphic +
dimorphic +
villous +
2.5mm;3.3mm +
staminate +
Tex. +
straight +
distinct +
proximal +
1;5 +
bisexual +
dispersed +
singly +
discoid +
indeterminate +
1;3 +
surrounding +
hemispheric +
opposite +
cauline +
reddish +
triangular +
lobed +
white-villous +
2-carpellate +
inferior +
attached +
anatropous +
3-toothed +
persistent +
falling +
absent +
coroniform +
tough +
thick +
absent +
connate +
short-attenuate +
persistent +
distinct +
falling +
unequal +
Mem. Torrey Bot. Club +
1969 +
neuter +
absent +
sterile +
14;16 +
paleate +
flat;slightly convex +
fibrous +
shorter +
aristate +
exalbuminous +
modifed +
2;3 +
alternate +
branched +
procumbent +
erect +
continuous +
2-branched +
papillate +
Helianthus praecox subsp. hirtus +
Helianthus praecox +
subspecies +
campanulate +
equaling +
shorter +
annual +