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Mad River fleabane, Mad River fleabane daisy

Watson's fleabane

Habit Perennials, 10–22(–27) cm, tap-rooted, caudices usually simple, rarely with branches to 20 cm. Perennials, 3–10 cm; taprooted, caudices sometimes multicipital, branches relatively short and thick, sometimes relatively long and slender.
Stems

ascending to decumbent-ascending (usually basally purplish), sparsely to densely strigose (basal cells inclined, hairs even-width), eglandular.

ascending to decumbent-ascending, glabrous, eglandular.

Leaves

basal (persistent) and cauline;

blades (strongly to weakly 3-nerved) oblanceolate to spatulate-oblanceolate, 30–100 × (3–)5–12(–14) mm, cauline gradually reduced distally or not, usually continuing to near heads, margins entire, faces hirsuto-pilose to weakly pilose, eglandular.

mostly basal (persistent);

blades narrowly oblanceolate to spatulate (often folding), 15–60 × 1–5 mm, cauline abruptly reduced distally, margins entire, abaxial faces glabrous, adaxial sparsely strigose, eglandular.

Involucres

(5–)6–7 × 9–12(–14) mm.

4–7 × 5–10 mm.

Ray florets

(16–)21–33;

corollas white to pinkish or purplish, 10–12 mm, laminae not (or weakly) coiling or reflexing.

13–25, corollas white to pink, 4–6 mm, laminae not coiling or reflexing, spreading.

Disc corollas

3.2–3.8 mm.

2.8–4 mm.

Phyllaries

in 2–3(–4) series, (elliptic- to oblong-oblanceolate, abruptly acuminate), hirsuto-strigose to -pilose, densely villous at bases, usually eglandular, sometimes sparsely glandular.

in 2–3 series (inner usually with purple margins), glabrous, minutely glandular.

Heads

1(–4) (on peduncles 0.5–5 cm), held well beyond leaves at peak flowering, from branches near midstem (or slightly more distal).

1(–2).

Cypselae

2–2.5 mm, 2-nerved, faces sparsely strigose;

pappi: outer of setae, inner of 16–20 bristles.

2–3.2 mm, 2-nerved, faces sparsely strigose;

pappi: outer of setae, inner of 25–35 (straw-colored, dull) bristles.

Erigeron maniopotamicus

Erigeron watsonii

Phenology Flowering Jun–Aug. Flowering Jul–Sep.
Habitat Dry, barren meadows and openings in mixed conifer woodlands Gravelly or rocky slopes, ridge tops, talus, soil pockets, sagebrush, limber pine-fir
Elevation 1300–1500 m (4300–4900 ft) 2400–3300 m (7900–10800 ft)
Distribution
from FNA
CA
[BONAP county map]
from FNA
ID; NV; UT
[BONAP county map]
Discussion

Of conservation concern.

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

Source FNA vol. 20, p. 279. FNA vol. 20, p. 304.
Parent taxa Asteraceae > tribe Astereae > Erigeron Asteraceae > tribe Astereae > Erigeron
Sibling taxa
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. lassenianus, E. latus, E. leibergii, E. leiomerus, E. lemmonii, E. linearis, E. lobatus, E. lonchophyllus, E. maguirei, E. mancus, 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
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. lassenianus, 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. wilkenii, E. yukonensis
Synonyms Aster watsonii
Name authority G. L. Nesom & T. W. Nelson: Sida 21: 673, fig. 1. (2004) (A. Gray) Cronquist: Brittonia 6: 207. (1947)
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