Chaenactis santolinoides

Greene

Bull. Torrey Bot. Club 9: 17. 1882.

Common names: Santolina pincushion
EndemicConservation concern
Treatment appears in FNA Volume 21. Treatment on page 407. Mentioned on page 404.

Perennials, 10–25 (–35) cm (cespitose or ± matted); proximal indument thinning with age, whitish to grayish, lanuginose. Stems mostly 5–15+, erect to ± spreading. Leaves basal, (1–) 3–11 cm; largest blades linear-cylindric to ± fusiform, 3-dimensional, 1–2-pinnately lobed; primary lobes (7–) 10–18+ pairs, ± imbricate, ultimate lobes ± involute, twisted. Heads 1 (–3) per stem. Peduncles mostly ascending to erect, mostly 8–25 cm. Involucres obconic to ± cylindric. Phyllaries: longest 8–13 mm; outer evidently stipitate-glandular and, sometimes, ± arachnoid, apices erect, ± rigid. Corollas 5–7 mm. Cypselae 4–6 mm; pappi: longest scales 3–4.5 mm. 2n = 12.


Phenology: Flowering (Mar–)May–Jul.
Habitat: Exposed sandy to rocky summits, ridges, scree, talus, openings in or above conifer forests, sometimes road cuts or other recent disturbances
Elevation: (1100–)1500–2800 m

Discussion

Of conservation concern.

Chaenactis santolinoides is known from the southern Sierra Nevada and Transverse Ranges. It is sometimes cultivated in rock gardens and may be found beyond its native range. It may be relatively recently derived from an isolated segment of C. douglasii var. alpina. The morphology of C. panamintensis (here assigned to C. douglasii var. alpina) suggests past convergence toward, or genetic influence from, C. santolinoides.

Selected References

None.

Lower Taxa

None.

"longest" is not a number.

... more about "Chaenactis santolinoides"
not tailed +, rounded +  and obtuse +
connate +  and distinct +
subequal +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
paniculiform +, cymiform +  and corymbiform +
indeterminate +  and determinate +
James D. Morefield +
Greene +
decurrent +
Undefined sect. Macrocarphus +
compound +  and simple +
lobed;ovate;oblanceolate;ovate;oblanceolate;linear;deltate +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
connate +  and distinct +
Santolina pincushion +
actinomorphic +
white +  and pinkish or cream +
stipitate-glandular +  and hairy +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
fertile +  and bisexual +
fertile +  and bisexual +
(1100–)1500–2800 m +
strigose +  and densely sericeous +
scabrellous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
campanulate +  and cylindric +
Exposed sandy to rocky summits, ridges, scree, talus, openings in or above conifer forests, sometimes road cuts or other recent disturbances +
in more or less cymiform arrays +, singly +  and radiant +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
obconic;more or less cylindric +
lobed +, linear-cylindric +  and more or less fusiform +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
3 cm30 mm <br />0.03 m <br /> (?) +  and 11 cm110 mm <br />0.11 m <br /> (?) +
deltate +  and more or less lanceolate +
0.3 cm3 mm <br />0.003 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
dentate to pinnatifid or palmatifid +  and entire +
arachnoid +  and stipitate-glandular +
2-carpellate +
persistent +
coroniform +
8 cm80 mm <br />0.08 m <br /> (25 cm250 mm <br />0.25 m <br />) +
Flowering (Mar–)May–Jul. +
5 +  and 21 +
0.8 cm8 mm <br />0.008 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
whitish +  and grayish +
Bull. Torrey Bot. Club +
bearing subulate enations +, hairy +  and bristly +
knobby;convex;more or less flat +
distinct +
10 +  and 20 +
exalbuminous +
unequal +
Endemic +  and Conservation concern +
erect +  and more or less spreading +
5 +  and 15 +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Undefined (tribe Undefined) subtribe Bahiinae +  and Undefined (tribe Undefined) subtribe Palafoxiinae +
Chaenactis santolinoides +
Chaenactis sect. Macrocarphus +
species +
cylindric +
80 cm800 mm <br />0.8 m <br /> (300 cm3,000 mm <br />3 m <br />) +
1 cm10 mm <br />0.01 m <br /> (80 cm800 mm <br />0.8 m <br />) +
toothed +  and entire +
25 cm250 mm <br />0.25 m <br /> (35 cm350 mm <br />0.35 m <br />) +
10 cm100 mm <br />0.1 m <br /> (25 cm250 mm <br />0.25 m <br />) +