Chaenactis nevii

A. Gray

Proc. Amer Acad. Arts 19: 30. 1883.

Common names: John Day pincushion
Endemic
Treatment appears in FNA Volume 21. Treatment on page 411. Mentioned on page 408, 409.

Plants 10–30 cm; proximal indument greenish to grayish, stipitate-glandular and, sometimes, sparsely arachnoid or villous. Stems mostly 1–3; branches mainly distal. Leaves basal (withering) and cauline, 2–5 cm; largest blades ± elliptic, ± plane to 3-dimensional, not succulent, 1–2-pinnately lobed; primary lobes mostly 3–8 pairs, ± remote, ultimate lobes ± plane to involute. Heads mostly 3–9 per stem. Peduncles 1–6 cm, distally stipitate-glandular and, sometimes, ± arachnoid to villous. Involucres ± hemispheric to campanulate. Phyllaries: longest 6–9 mm; outer predominantly stipitate-glandular and, sometimes, ± arachnoid to villous in fruit, apices ± erect, acute, rigid. Florets: corollas bright-yellow, 4–6.5 mm; peripheral corollas ± erect, actinomorphic, scarcely enlarged. Cypselae 3.5–6 mm (compressed); pappi 0 or coroniform (of ± 10 scales, longest 0.1–0.5 mm). 2n = 12.


Phenology: Flowering late Apr–mid July.
Habitat: Nearly barren, heavy clay soils from volcanic ash and tuff, sometimes disturbed or moist sites
Elevation: 400–1000 m

Discussion

Chaenactis nevii is known from the John Day Basin area in Gilliam, Grant, Jefferson, Wasco, and Wheeler counties. This odd and isolated species combines traits of C. artemisiifolia (sect. Acarphaea) and C. glabriuscula, and might be descended from their common ancestor.

Selected References

None.

Lower Taxa

None.

"longest" is not a number.

... more about "Chaenactis nevii"
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 +
A. Gray +
decurrent +
compound +  and simple +
lobed;ovate;oblanceolate;ovate;oblanceolate;linear;deltate +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
connate +  and distinct +
John Day pincushion +
actinomorphic +
bright-yellow +
stipitate-glandular +  and hairy +
0.4 cm4 mm <br />0.004 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
fertile +  and bisexual +
fertile +  and bisexual +
400–1000 m +
strigose +  and densely sericeous +
scabrellous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
campanulate +  and cylindric +
Nearly barren, heavy clay soils from volcanic ash and tuff, sometimes disturbed or moist sites +
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 />) +
less hemispheric;campanulate +
lobed +  and plane +
cauline +  and basal +
2 cm20 mm <br />0.02 m <br /> (?) +  and 5 cm50 mm <br />0.05 m <br /> (?) +
deltate +  and more or less lanceolate +
dentate to pinnatifid or palmatifid +  and entire +
less arachnoid +  and villous +
acute +  and blunt +
2-carpellate +
persistent +
coroniform +
less arachnoid +  and villous +
1 cm10 mm <br />0.01 m <br /> (6 cm60 mm <br />0.06 m <br />) +
Flowering late Apr–mid July. +
5 +  and 21 +
0.6 cm6 mm <br />0.006 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
greenish +  and grayish +
villous +, arachnoid +  and stipitate-glandular +
Proc. Amer Acad. Arts +
bearing subulate enations +, hairy +  and bristly +
knobby;convex;more or less flat +
distinct +
4 +  and 8 +
exalbuminous +
unequal;unequal +
5 (?) +  and 12 (?) +
usually erect +  and ascending +
1 +  and 3 +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Undefined (tribe Undefined) subtribe Bahiinae +  and Undefined (tribe Undefined) subtribe Palafoxiinae +
Chaenactis nevii +
Chaenactis sect. Chaenactis +
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 />) +
less plane;involute +
toothed +  and entire +
70 cm700 mm <br />0.7 m <br /> (200 cm2,000 mm <br />2 m <br />) +
5 cm50 mm <br />0.05 m <br /> (70 cm700 mm <br />0.7 m <br />) +