''Hymenoxys grandiflora'' is a North American species of flowering plant in the

daisy family The family Asteraceae, alternatively Compositae, consists of over 32,000 known species of flowering plants in over 1,900 genera within the order Asterales. Commonly referred to as the aster, daisy, composite, or sunflower family, Compositae w ...

known by the common names graylocks four-nerve daisy, graylocks rubberweed, or old man of the mountain. It is native to high elevations in the Rocky Mountains of the western United States.

Description

''H. grandiflora'' is a perennial herb up to 30 centimeters (1 foot) tall. The

leaves A leaf (plural, : leaves) is any of the principal appendages of a vascular plant plant stem, stem, usually borne laterally aboveground and specialized for photosynthesis. Leaves are collectively called foliage, as in "autumn foliage", wh ...

are long. The plant generally produces one flower head per stem, up to 10 per plant, present between June and August. Each head has 15–44 ray flowers and 150–400 disc flowers.Flora of North America, ''Hymenoxys grandiflora'' (Torrey & A. Gray) K. F. Parker, 1950. Graylocks rubberweed, four-nerved daisy
/ref> The seeds are five-sided with narrow scales at the tip. The species has the largest flowers of any in its genus, hence the

specific epithet In taxonomy, binomial nomenclature ("two-term naming system"), also called nomenclature ("two-name naming system") or binary nomenclature, is a formal system of naming species of living things by giving each a name composed of two parts, bot ...

''grandiflora'' (large-flowered).

Distribution and habitat

The plant is native to high elevations in the Rocky Mountains of the western United States, in the states of Montana, Idaho, Wyoming, Utah, Colorado, and New Mexico.SEINet, Southwestern Biodiversity, Arizona chapter
description, photos, distribution map It can be found on rocky slopes, meadows, and tundra environments.

References

External links

* grandiflora Flora of Colorado Flora of the Western United States Flora of the Rocky Mountains Plants described in 1845 Flora without expected TNC conservation status {{Asteroideae-stub