Hazardia detonsa

(Greene) Greene

Pittonia 1: 29. 1887.

Common names: Island bristleweed
Endemic
Basionym: Corethrogyne detonsa Greene Bull. Torrey Bot. Club 10: 41. 1883
Synonyms: Haplopappus detonsus (Greene) P. H. Raven
Treatment appears in FNA Volume 20. Treatment on page 449. Mentioned on page 446.

Shrubs, 60–250 cm. Stems lanate-tomentose. Leaves subsessile or subpetiolate; blades obovate, 40–140 × 10–50 mm, subcoriaceous, bases not clasping, margins serrulate to subentire, abaxial faces densely lanate-tomentose, adaxial densely short-tomentose. Heads in thyrsiform to subcorymbiform heads. Involucres campanulate, 10–13 × 10–13 mm. Phyllaries erect, oblong, apices acute, faces densely woolly. Ray-florets 6–14, fertile; corollas shorter than involucre, inconspicuous. Disc-florets 30–40; corollas 8–10 mm. Cypselae 3–4 mm, canescent. 2n = 10.


Phenology: Flowering Apr–Nov.
Habitat: Open, rocky hillsides, canyon walls, often with Pinus, Quercus, Ceanothus, Rhus, Arctostaphylos
Elevation: 10–300 m

Discussion

Hazardia detonsa is known from Anacapa, Santa Rosa, and Santa Cruz islands. It is little differentiated from H. cana and clearly its evolutionary sister. In both taxa, the ray and disc florets often change to red-purple with maturity.

Selected References

None.

Lower Taxa

None.

"fine" is not a number.

... more about "Hazardia detonsa"
lanate-tomentose +
short-tomentose +
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
cymiform +, thyrsiform +, paniculiform +, racemiform +  and spiciform +
indeterminate +  and determinate +
W. Dennis Clark +
(Greene) Greene +
decurrent +
Corethrogyne detonsa +
4 cm40 mm <br />0.04 m <br /> (14 cm140 mm <br />0.14 m <br />) +
obovate +
subcoriaceous +
1 cm10 mm <br />0.01 m <br /> (5 cm50 mm <br />0.05 m <br />) +
rugulose +  and muricate +
barbellulate +  and barbellate +
reddish-brown +
Island bristleweed +
not 2-lipped +  and actinomorphic +
yellow +, red-purple +  and drying +
inconspicuous +
ampliate +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
beaked +, 2-ribbed +  and 5-ribbed +
fusiform +  and deltoid subterete +
fertile +  and bisexual +
fertile +  and bisexual +
10–300 m +
resinous +
gland-dotted +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Open, rocky hillsides, canyon walls, often with Pinus, Quercus, Ceanothus, Rhus, Arctostaphylos +
discoid +  and disciform +
subcorymbiform +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
1 cm10 mm <br />0.01 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
campanulate +
1 cm10 mm <br />0.01 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
subpetiolate +  and subsessile +
spreading;erect +
triangular +
dentate to pinnatifid +  and entire +
serrulate +  and subentire +
not scarious +
2-carpellate +
persistent +
Flowering Apr–Nov. +
bearing subulate enations +, hairy +  and bristly +
concave;usually flat;conic +
exalbuminous +
lanate-tomentose +
appendaged +  and truncate +
papillate +  and smooth +
Haplopappus detonsus +
Hazardia detonsa +
Hazardia +
species +
6] +, [4 +  and 5 +