Tonestus eximius

(H. M. Hall) A. Nelson & J. F. Macbride

Bot. Gaz. 65: 70. 1918.

Common names: Lake Tahoe serpentweed
Endemic
Basionym: Haplopappus eximius H. M. Hall Univ. Calif. Publ. Bot. 6: 170, fig. 2, plate 20. 1915
Treatment appears in FNA Volume 20. Treatment on page 183. Mentioned on page 173, 182, 184.

Perennials, cespitose, 5–13 cm; with branched caudices surmounting ± well-developed taproots, or short rhizomes. Stems (clothed with marcescent leaf-bases) glabrous, densely stipitate-glandular. Leaves: basal blades broadly spatulate, 20–35 × 12–15 mm, margins coarsely, irregularly serrate to dentate; cauline blades oblong, 9–52 × 5–15 mm, ± reduced distally, margins coarsely, irregularly serrate or nearly entire; 1-nerved or 3-nerved, margins stipitate-glandular, faces glabrous, stipitate-glandular. Heads usually borne singly, sometimes 2–4. Peduncles 2–15 mm. Involucres broadly campanulate, 9–16 (–20) × 5–11 (–15) mm. Phyllaries 16–32 in 3–4 series, 1-nerved or weakly 3-nerved, ± equal, margins eciliate; outer and mid green, oblong, 6–10 × 2–5 mm, foliaceous, apices rounded or obtuse to acute; inner green or sometimes anthocyanic, linear, 7–9 × 0.5–2 mm, chartaceous proximally, margins scarious, fimbriate and/or stipitate-glandular distally, apices acute to acuminate, often reflexed, faces stipitate-glandular distally. Ray-florets 10–13; laminae elliptic, 5–8 × 1–3 mm. Disc-florets 41–49; corollas narrowly funnelform, 5.5–7.5 (–8.2) mm, exceeding involucres, lobes erect, 0.7–1.7 mm, 1/10–1/5 corolla length; anthers 2.5–3.3 mm; style-branch appendages subulate, 0.9–1.3 mm, stigmatic lines 0.9–1.6 mm. Cypselae linear, 2.5–6 mm, 5–9-nerved, faces villous, often ± viscid; pappus bristles 19–43, brittle. 2n = 18.


Phenology: Flowering and fruiting early–late summer.
Habitat: Crevices of granitic outcrops, talus slopes, in alpine and coniferous subalpine communities
Elevation: 1800–3300 m

Discussion

Tonestus eximius is known only from the upper elevations of the Sierra Nevada in the vicinity of Lake Tahoe in Alpine and El Dorado counties, California, and Washoe County, Nevada. It is similar to Lorandersonia peirsonii, although smaller in most respects.

Selected References

None.

Lower Taxa

None.
... more about "Tonestus eximius"
not tailed +, rounded +  and obtuse +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.33 cm3.3 mm <br />0.0033 m <br />) +
distinct +
acute;acuminate +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
spiciform +, racemiform +, paniculiform +  and corymbiform +
indeterminate +  and determinate +
Caleb A. Morse +
(H. M. Hall) A. Nelson & J. F. Macbride +
5-nerved +, 3-nerved +  and 1-nerved +
2 cm20 mm <br />0.02 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
1.2 cm12 mm <br />0.012 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
decurrent +
Haplopappus eximius +
compound +  and simple +
rugulose +  and muricate +
barbellulate +  and barbellate +
0.9 cm9 mm <br />0.009 m <br /> (5.2 cm52 mm <br />0.052 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
Lake Tahoe serpentweed +
not 2-lipped +  and actinomorphic +
0.75 cm7.5 mm <br />0.0075 m <br /> (0.82 cm8.2 mm <br />0.0082 m <br />) +
0.55 cm5.5 mm <br />0.0055 m <br /> (0.75 cm7.5 mm <br />0.0075 m <br />) +
beaked +, 2-ribbed +  and 5-ribbed +
terete +, cylindric +  and linear +
fertile +  and bisexual +
fertile +  and bisexual +
Calif. +  and Nev. +
1800–3300 m +
villous +, stipitate-glandular +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Crevices of granitic outcrops, talus slopes, in alpine and coniferous subalpine communities +
discoid +  and radiate +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
anthocyanic +  and green +
0.7 cm7 mm <br />0.007 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
linear +  and narrowly oblong +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
1.6 cm16 mm <br />0.016 m <br /> (2 cm20 mm <br />0.02 m <br />) +
1.1 cm11 mm <br />0.011 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
0.9 cm9 mm <br />0.009 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
campanulate +
0.5 cm5 mm <br />0.005 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
3-nerved +  and 1-nerved +
cauline +  and basal +
deltate +  and broadly lanceolate +
entire +, serrate +, irregularly serrate +  and dentate +
stipitate-glandular +  and eciliate +
fimbriate +
0.6 cm6 mm <br />0.006 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
2-carpellate +
persistent +
pliable +  and brittle +
0.2 cm2 mm <br />0.002 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
Flowering and fruiting early–late summer. +
3-nerved +  and 1-nerved +
anthocyanic +  and green +
bearing subulate enations +, hairy +  and bristly +
well-developed +
exalbuminous +
stipitate-glandular +  and glabrous +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.16 cm1.6 mm <br />0.0016 m <br />) +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.13 cm1.3 mm <br />0.0013 m <br />) +
appendaged +  and truncate +
papillate +  and smooth +
Haplopappus sect. Tonestus +
well-developed +
Tonestus eximius +
Tonestus +
species +
ampliate +
5 cm50 mm <br />0.05 m <br /> (13 cm130 mm <br />0.13 m <br />) +
tree +, shrub +  and subshrub +