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Mt. Lassen fleabane

Lassen fleabane, Mt. Lassen fleabane

Habit 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.

Involucres

4–5.5 × 6–10(–12) mm.

Ray (pistillate) florets

0.

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.

Phyllaries

in 2–3 series (commonly strongly keeled to nearly folded), moderately hirsuto-villous or villous, densely minutely glandular.

Heads

(1–)3–7.

Cypselae

1.5–2.3 mm, 2-nerved, faces sparsely strigose;

pappi: outer of setae, inner of 12–24 bristles.

Erigeron lassenianus var. deficiens

Erigeron lassenianus

Phenology Flowering Jun–Sep.
Habitat Open, rocky sites, barren flats, gravelly soils, sometimes serpentine
Elevation 1200–1900 m (3900–6200 ft)
Distribution
from FNA
CA
[BONAP county map]
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
Discussion

Varieties 2 (2 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Key
1. Ray (pistillate) florets 12–36
var. lassenianus
1. Ray (pistillate) florets 0
var. deficiens
Source FNA vol. 20, p. 282. FNA vol. 20, p. 282.
Parent taxa Asteraceae > tribe Astereae > Erigeron > Erigeron lassenianus Asteraceae > tribe Astereae > Erigeron
Sibling taxa
E. lassenianus var. lassenianus
E. abajoensis, E. acomanus, E. acris, E. aequifolius, E. algidus, E. aliceae, E. allocotus, E. alpiniformis, E. anchana, E. annuus, E. aphanactis, E. arenarioides, E. argentatus, E. arisolius, E. arizonicus, E. asperugineus, E. aureus, E. barbellulatus, E. basalticus, E. bellidiastrum, E. bigelovii, E. biolettii, E. blochmaniae, E. bloomeri, E. breweri, E. caespitosus, E. calvus, E. canaani, E. canus, E. cascadensis, E. cavernensis, E. cervinus, E. chrysopsidis, E. clokeyi, E. compactus, E. compositus, E. concinnus, E. consimilis, E. corymbosus, E. coulteri, E. cronquistii, E. davisii, E. decumbens, E. denalii, E. disparipilus, E. divergens, E. eatonii, E. elatior, E. elatus, E. elegantulus, E. elmeri, E. engelmannii, E. evermannii, E. eximius, E. filifolius, E. flabellifolius, E. flagellaris, E. flettii, E. foliosus, E. formosissimus, E. garrettii, E. geiseri, E. glabellus, E. glacialis, E. glaucus, E. goodrichii, E. gracilis, E. grandiflorus, E. greenei, E. heliographis, E. hessii, E. howellii, E. humilis, E. hyperboreus, E. hyssopifolius, E. inornatus, E. jonesii, E. kachinensis, E. karvinskianus, E. klamathensis, E. kuschei, E. lackschewitzii, E. lanatus, E. latus, E. leibergii, E. leiomerus, E. lemmonii, E. linearis, E. lobatus, E. lonchophyllus, E. maguirei, E. mancus, E. maniopotamicus, E. mariposanus, E. melanocephalus, E. miser, E. modestus, E. muirii, E. multiceps, E. nanus, E. nauseosus, E. nematophyllus, E. neomexicanus, E. nivalis, E. ochroleucus, E. oreganus, E. oreophilus, E. ovinus, E. oxyphyllus, E. pallens, E. parishii, E. parryi, E. peregrinus, E. petrophilus, E. philadelphicus, E. pinnatisectus, E. piperianus, E. piscaticus, E. poliospermus, E. porsildii, E. pringlei, E. procumbens, E. pulchellus, E. pulcherrimus, E. pumilus, E. purpuratus, E. pygmaeus, E. quercifolius, E. radicatus, E. reductus, E. religiosus, E. rhizomatus, E. robustior, E. rybius, E. rydbergii, E. salishii, E. salmonensis, E. sanctarum, E. saxatilis, E. sceptrifer, E. scopulinus, E. serpentinus, E. sionis, E. sivinskii, E. sparsifolius, E. speciosus, E. strigosus, E. subglaber, E. subtrinervis, E. supplex, E. tenellus, E. tener, E. tenuis, E. tracyi, E. trifidus, E. tweedyi, E. uintahensis, E. uncialis, E. uniflorus, E. untermannii, E. ursinus, E. utahensis, E. vagus, E. velutipes, E. vernus, E. versicolor, E. vetensis, E. vicinus, E. vreelandii, E. watsonii, E. wilkenii, E. yukonensis
Subordinate taxa
E. lassenianus var. deficiens, E. lassenianus var. lassenianus
Name authority Cronquist: Brittonia 7: 171. (1947) Greene: Fl. Francisc., 389. (1897)
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