Al Schneider's Rocky Mountains Plant Descriptions

White Hawkweed
Hieracium albiflorum
Aster family (Asteraceae)

White Hawkweed (Hieracium albiflorum) commonly occurs through the Rockies and through all the Pacific coast states. It is a tall lanky plant with small white flowers in an open, airy spread. Hieracium is the classical name given to various composite flowers in the Mediterranean area; the word is derived from the Greek word for "Falcon," and the plants are still commonly called "Hawkweeds." This species of Hawkweed was first collected for science by the eminent botanist, naturalist, and explorer, Thomas Drummond in the Canadian Rockies.


©2014 Richard Spellenberg

Description

plant with stems to 2' tall, leafy below and nearly leafless above, hairy below and above. 1-5" long and to 2" wide, petioled, to , hairy. Stem leaves , , less hairy. Flowerheads numerous in spreading, open clusters. about 1/3" high, or sparsely hairy. only, white to light yellow, finely at the squared-off tips. hairs tawny, sometimes white. a cylindrical .

Field Marks

Medium tall plant with numerous and lower stem leaves and few small upper stem leaves. Small white flowers in open spreading arrangement.

© Al Schneider

oblanceolate -- top wider than bottom

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.

serrate -- toothed with asymmetrical teeth pointing forward; like the cutting edge of a saw.

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.

basal -- at the base, situated or attached at the base.

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

sessile -- attached without a stalk. For example, a leaf that clasps the stalk. A petiolate leaf has a stalk.

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

blade -- Just the flat part of a leaf. Not the stem.

glabrous -- smooth, glossy, having no bristles or hair-like structures. Bald.

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

oblong -- Having an elongated form with somewhat parallel sides. Rectangular.