Lessingia arachnoidea

Greene

Leafl. Bot. Observ. Crit. 2: 29. 1910.

Common names: Crystal Springs lessingia
EndemicConservation concern
Synonyms: Lessingia hololeuca var. arachnoidea (Greene) J. T. Howell Lessingia micradenia var. arachnoidea (Greene) Ferris
Treatment appears in FNA Volume 20. Treatment on page 457. Mentioned on page 453.

Plants 15–80 cm. Stems erect, tan, glabrous or villous. Leaves: basal withering by flowering; cauline margins entire, faces eglandular, abaxial glabrous or villous. Heads borne singly, at ends of branchlets. Involucres obconic, 4–8 mm. Phyllaries purple-tipped, faces arachnose, sometimes gland-dotted; inner scarious. Disc-florets (3–) 8–18; corollas pink to lavender (color more intense in tubes); style-branch appendages truncate-penicillate, 0.1–0.3 mm. Pappi tan, usually shorter than cypselae, sometimes forming coronas, rarely equaling or longer than cypselae (Sonoma County). 2n = 10.


Phenology: Flowering Jul–Oct.
Habitat: Grasslands, coastal scrub, chaparral, woodlands, serpentinite soils
Elevation: 100–300 m

Discussion

Of conservation concern.

Lessingia arachnoidea is known from near Crystal Springs Reservoir in San Mateo County and near Camp Meeker in Sonoma County. Previous circumscriptions of L. arachnoidea (pappi shorter than cypselae, forming coronas) have been expanded to include plants (from Sonoma County) with pappi equaling or longer than cypselae. Alternatively, the plants with longer pappi could have been accommodated in L. ramulosa (as a glandless form); the absence of basal leaves at flowering and the presence of arachnoid indument on the phyllaries suggest a closer affinity to L. arachnoidea.

Selected References

None.

Lower Taxa

None.
... more about "Lessingia arachnoidea"
villous +  and glabrous +
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
spiciform +, racemiform +, paniculiform +  and corymbiform +
indeterminate +  and determinate +
Staci Markos +
Greene +
decurrent +
obovate;lanceolate linear or subulate +
rugulose +  and muricate +
barbellulate +  and barbellate +
Crystal Springs lessingia +
not 2-lipped +  and actinomorphic +
pink +  and lavender +
5-10-nerved +  and smooth +
beaked +, 2-ribbed +  and 5-ribbed +
not compressed +, cuneiform +  and linear +
fertile +  and bisexual +
fertile +  and bisexual +
100–300 m +
gland-dotted +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Grasslands, coastal scrub, chaparral, woodlands, serpentinite soils +
in more or less corymbiform arrays +  and singly +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.4 cm4 mm <br />0.004 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
sessile +  and petiolate +
cauline +  and basal +
spreading;erect +
lanceolate +
dentate to pinnately lobed +  and entire +
2-carpellate +
persistent +
connate +  and distinct +
Flowering Jul–Oct. +
recurved +  and erect +
lanceolate +, ovate +  and oblong +
Leafl. Bot. Observ. Crit. +
styliferous +, neuter +  and pistillate +
bearing subulate enations +, hairy +  and bristly +
exalbuminous +
Endemic +  and Conservation concern +
branched +  and simple +
villous +  and glabrous +
truncate-penicillate +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
appendaged +  and truncate +
papillate +  and smooth +
Lessingia hololeuca var. arachnoidea +  and Lessingia micradenia var. arachnoidea +
Lessingia arachnoidea +
Lessingia +
species +
2 cm20 mm <br />0.02 m <br /> (90 cm900 mm <br />0.9 m <br />) +