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Tonestus graniticus
(Tiehm & L.Shultz) G.L.Nesom & D.R.Morgan
Family:
Asteraceae
Granite Serpentweed
[
Haplopappus graniticus
A.Tiehm & L.M.Shultz]
FNA
Resources
Caleb A. Morse in Flora of North America (vol. 20)
Perennials
, cespitose to ± mat-forming, 5.5-14 cm; with branched caudices surmounting well-developed taproots.
Stems
(clothed with marcescent leaf bases) densely stipitate-glandular.
Leaves:
basal blades ovate to spatulate, 12-40 × 5-12 mm; cauline petiolate (proximal) to sessile and ± clasping (distal), blades oblong to broadly lanceolate, 4-28 × 1-8 mm, markedly reduced distally; 1- or very weakly 3-nerved, margins usually irregularly dentate, rarely (basal, distal) entire, faces densely scabrous (hairs multicellular, conic), stipitate-glandular.
Heads
(1-)3-7(-11), in racemiform or apparently corymbi-form arrays.
Peduncles
0-15 mm (often apparently bracteolate).
Involucres
narrowly campanulate, 5-9 × 6-10 mm.
Phyllaries
18-32, in 3-4 series, often reflexed distally, green, 1-nerved, unequal, proximally chartaceous and ± keeled, margins eciliate, faces stipitate-glandular; outer and mid ovate to oblong, 2-6 × 1-2 mm, apices obtuse to acute; inner linear to narrowly lanceolate, 4-6 × 1-2 mm, margins scarious, stipitate-glandular distally, apices acute to acuminate.
Ray florets
0.
Disc florets
13-23; corollas funnelform to ± ampliate distally, 3.5-5.5 mm, scarcely exceeding involucres, lobes erect to slightly spreading, 0.8-1 mm,
1
/ 5 -
1
/ 4 corolla length; anthers 1.6-2.1 mm; style-branch appendages lanceolate, 0.7-1.1 mm, stigmatic lines 0.6-1.1 mm.
Cypselae
cylindric, 1.5-3 mm, weakly 4-7-nerved, faces strigose;
pappus bristles
25-35, brittle.
2
n
= 18.
Flowering and fruiting mid-late summer. Crevices of granite outcrops; of conservation concern; 2400 m; Nev.
Tonestus graniticus
is known only from the Great Basin, from the east side of Lone Mountain, Esmeralda County.
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