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Compilation
Erigeron trifidus

18 Images see all

Type? of Erigeron trifidus var. inconsummatus A. Nelson [family ASTERACEAE]
Isotype? of Erigeron compositus Pursh var. anticus Beaman [family ASTERACEAE]
Isotype of Erigeron trifidus Hook. [family ASTERACEAE]
Paratype of Erigeron vagus Payson [family ASTERACEAE]
Isotype of Erigeron trifidus Hook. var. prasinus Macbride & Payson [family ASTERACEAE]
Original material of Erigeron trifidus Hook. [family ASTERACEAE]
Erigeron trifidus Hook. var. inconsummatus A.Nelson [family ASTERACEAE]
Type of Erigeron trifidus Hooker [family ASTERACEAE]
Isotype of Erigeron trifidus Hooker var. prasinus J. F. Macbride & Payson [family ASTERACEAE]
Filed as Erigeron trifidus Hook. [family ASTERACEAE]
Type of Erigeron trifidus Hooker [family ASTERACEAE]
Isotype of Erigeron trifidus Hook. var. prasinus J. F. Macbr. & Payson [family ASTERACEAE]
Holotype of Erigeron compositus Pursh var. prasinus J.F.Macbr. & Payson [family ASTERACEAE]
Erigeron compositus Pursh. var. discoideus A.Gray [family COMPOSITAE]
Isotype of Erigeron trifidus Hook. var. prasinus J. F. Macbride & Payson [family ASTERACEAE]
Isotype? of Erigeron compositus Pursh var. anticus Beaman [family ASTERACEAE]
Filed as Erigeron trifidus Hook. [family ASTERACEAE]
Type? of Erigeron trifidus Hook. var. inconsummatus A.Nelson [family ASTERACEAE]
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Name

Identification
Isotype of Erigeron trifidus Hook. [family ASTERACEAE ] (stored under name); Verified by Not on sheet,
Related name
  • Erigeron trifidus
  • Erigeron compositus
Common name
  • Alberta fleabane, Flora of North America Vol. 20

Flora

Entry for Erigeron trifidus Hooker [family COMPOSITAE]
Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 20,
Names
Erigeron trifidus Hooker [family COMPOSITAE], Fl. Bor.-Amer., 2: 17, plate 120. 1834
Erigeron compositus Pursh var. trifidus (Hooker) A. Gray [family COMPOSITAE]
Treatment Author(s)
Guy L. Nesom
Information
Perennials, 3–8(–10) cm; taprooted, caudex branches rhizomelike, relatively thick to thin, woody. Stems mostly erect, hispido-hirsute, sometimes woolly distally, minutely glandular. Leaves basal (persistent); blades spatulate to obovate-spatulate, 8–30 × 3–6 mm, margins usually 3-lobed, sometimes 2-lobed or entire (lobes 3–8 mm, lanceolate to narrowly ovate or oblong, apices usually acute), ultimately entire, coarsely ciliate, faces hirsute, minutely glandular. Heads 1. Involucres 8–12 × 10–15 mm. Phyllaries in 2–3 series (purplish or purple-tipped), hirsute to villoso-hirsute, glandular. Ray florets 20–40; corollas white to pinkish, 10–15 mm, laminae not coiling or reflexing. Disc corollas 3.5–4.5 mm. Cypselae 2–2.5 mm, 2-nerved, faces sparsely strigose; pappi: outer of setae, inner of 15–20 bristles (not twisted). 2n = 45.
Phenology
jul-aug (summer)
Altitude range
ca. 2600–3400 m;
Distribution
Canada Alta.Canada B.C..
Discussion
Erigeron trifidus has been treated as a synonym of E. compositus; caudex branches of the latter usually are relatively thick and short, compared to those of E. trifidus, which are thinner and are not covered with persistent leaf bases. Leaves of E. trifidus are consistently 3-lobed. Erigeron trifidus was hypothesized (J. G. Packer 1983) to be of hybrid origin (based on its polyploid chromosome number and sterile pollen), with E. lanatus and E. compositus as the most likely parents (based on intermediate morphology and sympatry of the putative parents).

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