Tonestus graniticus

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 corymbiform 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. 2n = 18.

Phenology: Flowering and fruiting mid–late summer.
Habitat: Crevices of granite outcrops
Elevation: 2400 m

Distribution

• Generated Map
• Legacy Map

Nev.

Discussion

Of conservation concern.

Tonestus graniticus is known only from the Great Basin, from the east side of Lone Mountain, Esmeralda County.

Selected References

None.

Lower Taxa

None.