Al Schneider's Rocky Mountains Plant Descriptions

Aspen Fleabane
Erigeron speciosus
Aster family (Asteraceae)

Erigeron is the second largest of wildflowers in our area. (Astragalus is first and Penstemon is third.) Fleabanes are at first difficult to identify to the species level but studying key characteristics, such as the plant's height, habitat and altitude, and flower head structure rewards you with success. Erigeron formosissimus is similar to Erigeron speciosus but is distinguished by several factors: its shorter height, its tendency to grow in large clumps with a tight mat of , and its arching stems.

By some accounts, the name "fleabane" was given because the seeds are "so like fleas." "Specios" is Latin for "showy" or "beautiful." In 1753 Linnaeus gave the its name from the Greek "eri" ("early") + "geron" ("old man," as in "geriatrics," the study of old age processes and problems). The Greek name refers to the early flowering of many species, to the bristly hairs of the developing seeds, and to the puffy, grizzled appearance of the mature seed head. About 1830 David Douglas (of Douglas Fir fame) collected the first seeds of this plant in California; they were grown into plants in England.


©2019 John Doyen

Description

with a leafy stem, 7-30" tall, branching near the top into leafless stalks; each with a single flowerhead at the end. Flower consists of many narrow pink, lavender or white surrounding button of yellow flowers. Flowerheads are 1.5-2" wide, with all about the same length lined up side by side, not overlapping. Leaves long, , smooth, commonly with 3 obvious veins. Leaf bases joined to the stem about halfway around and therefore slightly . an .

Field Marks

Numerous narrow pink-lavender surrounding yellow disk; side-by-side, not overlapping. Clump forming, numerous in .

© Al Schneider

ray flowers -- The outer petals of a sunflower or daisy are ray flowers.

A perennial plant lives and blooms for many years.

achene -- a type of simple dry fruit produced by many species of flowering plants. For example, a rose hip holds a few achenes.

A herb is a plant whose stems die back to the ground in the winter.

ray flowers -- The outer petals of a sunflower or daisy are ray flowers.

Bracts are modified leaves associated with a flower.

Involucre is the name given to the circle or spiral collection of bracts around a flower-cluster.

pappus -- Small scales, bristles or hairs at the top of the seed in Asteraceae. For example, dandelion parachutes. Plural: pappi.

disc flowers are those in the center of a sunflower or daisy. Not a ray flower.

fruit -- any seed-bearing structure in flowering plants. It is formed from the ovary after flowering.

stalk -- The supporting structure of an organ. Examples of stalks are stem, peduncle, petiole, ...

basal leaves -- a leaf that grows lowest on the stem of a plant.

genus -- A subdivision of a botanical Family in which all members have a significant number of similar characteristics.

A clasping leaf suroundes part of all of the stem.

lanceolate -- Lance-shaped. Long, wider in the middle.

meadow -- Large grass and wildflower filled area with few, if any, trees.