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Coulter's daisy, Coulter's fleabane, large mountain fleabane

Watson's fleabane

Habit Perennials, 10–70 cm; rhizomatous, fibrous-rooted, sometimes with branched caudices and scale-leaved stolons. Perennials, 3–10 cm; taprooted, caudices sometimes multicipital, branches relatively short and thick, sometimes relatively long and slender.
Stems

erect, sparsely hispido-villous (hair cross walls sometimes black), often glabrate, eglandular.

ascending to decumbent-ascending, glabrous, eglandular.

Leaves

basal (persistent or not) and cauline;

proximal blades broadly oblanceolate to elliptic or oblong-lanceolate, 40–120(–150) × 7–25 mm, margins entire or with 1–5 pairs of shallow teeth, faces sparsely strigose to strigoso-villous, eglandular;

cauline blades becoming elliptic-ovate to lanceolate, gradually reduced distally (bases usually clasping).

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

7–10 × 10–16 mm.

4–7 × 5–10 mm.

Ray florets

45–140;

corollas 9–25 mm, laminae coiling, white.

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

Disc corollas

3–4.4 mm.

2.8–4 mm.

Phyllaries

in 2(–3) series, hirsuto-villous (hair cross walls black), minutely glandular.

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

Heads

1(–4).

1(–2).

Cypselae

(1.3–)1.5–1.8 mm, 2-nerved, faces sparsely strigose;

pappi: outer of setae, inner of 20–25 bristles.

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

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

2n

= 18.

Erigeron coulteri

Erigeron watsonii

Phenology Flowering (Jun–)Jul–Sep. Flowering Jul–Sep.
Habitat Moist coniferous woods, moist to wet meadows, open areas along creeks, aspen, spruce-fir Gravelly or rocky slopes, ridge tops, talus, soil pockets, sagebrush, limber pine-fir
Elevation 1800–3700 m (5900–12100 ft) 2400–3300 m (7900–10800 ft)
Distribution
from FNA
CA; CO; ID; MT; NM; NV; OR; UT; WY
[WildflowerSearch map]
[BONAP county map]
from FNA
ID; NV; UT
[BONAP county map]
Source FNA vol. 20, p. 332. 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. 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. 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 Porter: in T. C. Porter and J. M. Coulter, Syn. Fl. Colorado, 61. (1874) (A. Gray) Cronquist: Brittonia 6: 207. (1947)
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