Erigeron lassenianus

Greene

Fl. Francisc., 389. 1897.

Common names: Mt. Lassen fleabane
Endemic
Treatment appears in FNA Volume 20. Treatment on page 282. Mentioned on page 260, 273, 274, 275.

Perennials, 9–20 (–35) cm; taprooted, caudices essentially simple. Stems ascending to decumbent or prostrate, loosely strigose to hirtellous (hairs appressed-ascending to spreading, even-width, basal-cells inclined), usually minutely glandular distally. Leaves basal (usually persistent) and cauline; basal blades usually narrowly oblanceolate to linear, rarely narrowly spatulate, 50–120 (–150) × 3–6 (–9) mm, cauline blades relatively unreduced distally, margins entire, 1–3-nerved, faces sparsely to moderately hirtellous to pilose, often minutely glandular. Heads (1–) 3–7. Involucres 4–5.5 × 6–10 (–12) mm. Phyllaries in 2–3 series (commonly strongly keeled to nearly folded), moderately hirsuto-villous or villous, densely minutely glandular. Ray (pistillate) florets 12–36 or 0; corollas pink to lavender or white, 4.5–8 mm, laminae slightly coiling or not. Disc corollas 2.5–3.5 mm. Cypselae 1.5–2.3 mm, 2-nerved, faces sparsely strigose; pappi: outer of setae, inner of 12–24 bristles.

Discussion

Varieties 2 (2 in the flora).

Selected References

None.

Key

1 Ray (pistillate) florets 12–36 Erigeron lassenianus var. lassenianus
1 Ray (pistillate) florets 0 Erigeron lassenianus var. deficiens
... more about "Erigeron lassenianus"
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
paniculiform +, corymbiform +  and loose +
indeterminate +  and determinate +
Guy L. Nesom +
Greene +
12 cm120 mm <br />0.12 m <br /> (15 cm150 mm <br />0.15 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
5 cm50 mm <br />0.05 m <br /> (12 cm120 mm <br />0.12 m <br />) +
spatulate +, usually narrowly oblanceolate +  and linear +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
decurrent +
linear;lanceolate oblanceolate or spatulate +
rugulose +  and muricate +
Mt. Lassen fleabane +
not 2-lipped +  and actinomorphic +
pink +  and lavender or white +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
beaked +, 2-ribbed +  and 5-ribbed +
subterete +, oblong +  and oblong-obovoid compressed +
fertile +  and bisexual +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
fertile +  and bisexual +
strigose +, hirtellous +  and pilose +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
disciform +  and discoid +
in loose , corymbiform or paniculiform arrays +  and singly +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
1 cm10 mm <br />0.01 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
turbinate;hemispheric +
0.6 cm6 mm <br />0.006 m <br /> (1 cm10 mm <br />0.01 m <br />) +
not +  and coiling +
petiolate +  and sessile +
cauline +  and basal +
erect;spreading +
deltate +
Not (?) +  and Scarious (?) +
2-carpellate +
3-nerved +  and 1-nerved +
villous +  and hirsuto-villous +
narrowly elliptic +  and linear-lanceolate +
Fl. Francisc., +
bearing subulate enations +, hairy +  and bristly +
exalbuminous +
branched +  and simple +
prostrate +  and decumbent +
appendaged +  and truncate +
papillate +  and smooth +
Achaetogeron +  and Trimorpha +
Erigeron lassenianus +
Erigeron +
species +
inflated +  and tubular +
20 cm200 mm <br />0.2 m <br /> (35 cm350 mm <br />0.35 m <br />) +
9 cm90 mm <br />0.09 m <br /> (20 cm200 mm <br />0.2 m <br />) +
tree +, shrub +  and subshrub +