Contains 11 accepted taxa overall.
Characteristics
Classification
Citation
ERIGERON Linnaeus, Sp. Pl. 863. 1753, nom. cons. propos.
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TYPE: Erigeron uniflorus Linnaeus, typ. cons. propos.
Species
| Scientific Name | Common Name | Herbarium Specimens | Status | Photos |
|---|---|---|---|---|
| Erigeron annuus | EASTERN DAISY FLEABANE | Native FACU (NWPL) | ||
| Erigeron bellioides | BELLORITA | Not Native | ||
| Erigeron bonariensis | ASTHMAWEED | Not Native FACU (NWPL) | ||
| Erigeron canadensis | CANADIAN HORSEWEED | Native FACU (NWPL) AD (WAP) | ||
| Erigeron laevigatus | MANZANILLA HORSEWEED | Not Native | ||
| Erigeron philadelphicus | PHILADELPHIA FLEABANE | Native FAC (NWPL) | ||
| Erigeron pulchellus | ROBIN'S PLANTAIN | Native FACU (NWPL) | ||
| Erigeron quercifolius | OAKLEAF FLEABANE | Native FAC (NWPL) FAC (DEP) | ||
| Erigeron strigosus | PRAIRIE FLEABANE | Native FAC (NWPL) | ||
| Erigeron tenuis | SLENDERLEAF FLEABANE | Native | ||
| Erigeron vernus | EARLY WHITETOP FLEABANE | Native OBL (NWPL) FACW (DEP) |
Identification Key
1. Plant 4-15(20) cm long; heads 1-2 per stem
1. Plant (10)15-150+ cm long; heads 1-200+ per stem
2
2. Stem usually densely leafy; leaves generally linear to narrowly lanceolate or narrowly oblanceolate, 7-30 times longer than wide; ray corolla laminae 0-2 mm long; annuals
3
2. Stem sparsely to moderately leafy; leaves generally oblanceolate, spatulate, ovate, lanceolate, to oblong, 2-15 times longer than wide; ray corolla laminae 0.5-8 mm long; annuals or perennials
5
3. Leaf surfaces mostly densely strigose to hispidulous; phyllaries usually hispidulous to strigose; receptacles 3-5 mm wide in fruit; pistillate florets 60-150+; pappi 3-4+ mm long
3. Leaf surface mostly glabrate to sparsely strigose or hispidulous; phyllaries glabrous to sparsely strigose; receptacles 1-3 mm wide in fruit; pistillate florets 20-45+; pappi 2-3 mm long
4
4. Phyllaries usually glabrous, sometimes sparsely strigose; corollas of pistillate florets with laminae 0.3–1+ mm; cypselae uniformly pale tan to light gray-brown
4. Phyllaries usually sparsely strigose; corollas of pistillate florets with laminae 0 or to 0.3 mm; cypselae pale tan (usually some in each head with reddish nerves)
5. Ray laminae to 2 mm long, shorter than the phyllaries; basal leaves mostly not persistent and not rosette-forming
5. Ray laminae 3-8 mm long, subequal to longer than the phyllaries; larger leaves sometimes basal, persistent, and rosette-forming
6
6. Pappi of rays and discs often dissimilar, the ray without bristles, the disc with 0 or 8-15 bristles
7
6. Pappi of rays and discs similar, the ray and disc with 10-30 bristles
8
7. Stems hairs spreading, sometimes strigose distally; basal leaves usually withering by flowering, cauline little reduced proximal to midstem, blades lanceolate to oblong or ovate, margins coarsely serrate to nearly entire
7. Stems hairs usually ascending, rarely spreading; leaves: basal usually persistent to flowering, blades spatulate to broadly or narrowly oblanceolate to linear, cauline usually gradually reduced distally, margins entire or obscurely serrate or crenate
8. Plant mostly glabrate; leaf margins entire to faintly toothed; cauline leaves extremely reduced, usually <3 cm long and <0.7 mm wide; cypselae 4-nerved, 1.2-1.6 mm long
8. Plant usually strigose, hirsute, to villous; at least some leaves with distinct teeth; cauline leaves gradually to strongly reduced, usually some >3 cm long or >0.6 mm wide; cypselae 2-nerved, 0.6-1.5 mm long
9
9. Plants with sparsely scaly rhizomes
9. Plants without rhizomes
10
10. Basal leaves petiolate, the blade base abruptly contracted to a distinct petiole; cauline leaves not clasping; ray corollas 3-5 mm long
10. Basal leaves sessile, the blade base cuneate or attenuate; cauline leaves clasping to subclasping; ray corollas 4-10 mm long
11
11. Stem internodes usually shorter than the subtending leaves, the leaves gradually reduced upwards; involucres 4-6 mm long, 6-15 mm wide; ray florets 150-250(400), corollas usually white or pinkish, 5-10 mm; pappus bristles 15-20(30)
11. Stem internodes longer than the subtending leaves, the leaves strongly reduced upwards; involucres 2.5-4 mm long, 4.5-10 mm wide; ray florets 100-150, corollas usually blue, sometimes white to pink, 4-6 mm; pappus bristles 10-15
Genus Synonyms
| Synonym | Full Citation | Basionym | Type |
|---|---|---|---|
| Achaetogeron | Achaetogeron A. Gray, Mem. Amer. Acad. Arts, sser. 2. 4: 72. 1849. | TYPE: Achaetogeron wislizenii A. Gray 1848 | |
| Asterigeron | Asterigeron Rydberg, Fl. Rocky Mts. 891. 1918. | TYPE: Asterigeron watsonii (A. Gray) Rydberg (Aster watsonii A. Gray) | |
| Astradelphus | Astradelphus Remy, Ann. Sci. Nat., Bot., ser. 3. 12: 185. 1849. | TYPE: = Gusmania Remy 1849. | |
| Conyzella | Conyzella Fabricius, Enum. 86. 1759. | TYPE: Erigeron canadense Linnaeus 1753. | |
| Conyzoides | Conyzoides Fabricius, Enum. 85. 1759. | TYPE: = Erigeron Linnaeus 1753. | |
| Darwiniothamnus | Darwiniothamnus Harling, Acta Horti Berg. 20(3): 108.; 1962. | TYPE: Darwinothamnus tenuifolius (Hooker f.) Harling 1962. (Erigeron tenuifolius Hooker f. 1847.) | |
| Diplemium | Diplemium Raf., Fl. Tellur. 2; 50. 1837 ("1836"). | TYPE: Non designatus. | |
| Fragmosa | Fragmosa Rafinesque, Fl. Tellur. 2: 50. 1837 ("1836"). | TYPE: Non designatus. | |
| Gusmania | Gusmania Remy, in Gay, Fl. Chil. 4: 12. 1849. | TYPE: Gusmania chilensis Remy | |
| Leptilon | Leptilon Rafinesque ex Britton & A. Brown, Ill. Fl. N . U.S. 3: 390. 1898. | TYPE: = Ceanotus (Nuttall) Rafinesque 1837. | |
| Musteron | Musteron Rafinesque, Fl. Tellur. 2: 50. 1837 ("1836"). | TYPE: Musteron bellidifolium (Muhlenberg ex Willdenow) Rafinesque (Erigeron bellidifolium Muhlenberg ex Willdenow) | |
| Panios | Panios Adanson, Fam. Pl. 2: 124, 587. 1763. | TYPE: = Erigeron Linnaeus 1753. | |
| Phalacroloma | Phalacroloma Cassini, in Cuvier, Dict. Sci. Nat. 39: 404. 1826. | TYPE: Phalacroloma obtusifolium Cassini Lectotypified by Lessing, Syn. Gen. Compos. 188. 1832. | |
| Polyactidium | Polyactidium de Candolle, Prodr. 5: 281. 1836. | TYPE: Polyactidium dilphinifolium (Willdenow) de Candolle (Erigeron delphinifolius Willdenow) Substitute name for Polyactis Lessing 1832, non Link ex Gray 1821. | |
| Polyactis | Polyactis Lessing, Syn. Gen. Compos. 188. 1832, non Link ex Gray 1821. | TYPE: Polyactis delphinifolia (Willdenow) Lessing (Erigeron delphinifolius Willdenow) = Polyactidium de Candolle 1836. | |
| Stenactis | Stenactis Cassini, in Cuvier, Dict. Sci. Nat. 37: 462, 485. 1825. | TYPE: Stenactis annuus (Linnaeus) Lessing (Aster annuus Linnaeus) | |
| Terranea | Terranea Colla, Mem. Reale Accad. Sci. Torino 38: 11. 1835. | TYPE: Terranea fernandeziana Colla | |
| Tessenia | Tessenia Bubani, Fl. Pyren. 2: 264. 1899. | TYPE: = Erigeron Linnaeus 1753. | |
| Trimorpha | Trimorpha Cassini, Bull. Sci. Soc. Philom. Paris 1817: 137. 1817. | TYPE: Trimorpha vulgaris Cassini, nom. illegit. (Erigeron acre Linnaeus; Trimorpha acris (Linnaeus) Gray) | |
| Woodvillea | Woodvillea de Candolle, Prodr. 5: 318. 1836. | TYPE: Woodvillea calendulacea de Candolle | |
| Wyomingia | Syomingia A. Nelson, Bull. Torrey Bot. Club 26: 249. 1899. | TYPE: Non designatus. | |
| xConygeron | xConygeron Holub, Folia Geobot. Phytotax. 8(2): 156, 176. 1973. | TYPE: Conyza Lessing X Erigeron Linnaeus | |
| xConyzigeron | xConyzigeron Rauschert, Feddes Repert. 83: 656. 1973. | TYPE: Cnoyza Lessing X Erigeron Linnaeus |