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Dryas drummondii Richardson ex Hook.
Drummond's mountain-avens, Yellow mountain-avens, Yellow dryas
USDA Symbol: DRDR
This slow-growing perennial forms mats up to 3 ft. wide and 8 in. tall. The mats appear to be a mass of oval, leathery leaves with rounded teeth. The leaves remain dark green during winter but deteriorate rapidly as new leaves are produced in spring. Single, yellow flowers are borne atop 2-8 in. stems. The petal ascend, rather than spread, in flower; the result is that the flowers never seem to fully open. Summer fruits are fluffy and feathery.
The species name of this plant is named for Thomas Drummond, (ca. 1790-1835), naturalist, born in Scotland, around 1790. In 1830 he made a trip to America to collect specimens from the western and southern United States. In March, 1833, he arrived at Velasco, Texas to begin his collecting work in that area. He spent twenty-one months working the area between Galveston Island and the Edwards Plateau, especially along the Brazos, Colorado, and Guadalupe rivers. His collections were the first made in Texas that were extensively distributed among the museums and scientific institutions of the world. He collected 750 species of plants and 150 specimens of birds. Drummond had hoped to make a complete botanical survey of Texas, but he died in Havana, Cuba, in 1835, while making a collecting tour of that island.
Plant CharacteristicsDuration: Perennial Habit: Herb Leaf:
Fruit: Size Class:
Bloom InformationBloom Color: Yellow
Bloom Time: May , Jun , Jul
, WA Canada: BC Native Distribution: AK,
s. to all but s.w. B.C.; Rockies to MT; Pend Oreille Co., WA; Wallowa Co., OR; scattered e. in Canada Native Habitat:
High mt. rocky ridges, talus slopes & stream banks; occasion on gravel bars of foothills
Growing ConditionsWater Use: Medium
Light Requirement: Sun
Soil Moisture: Dry
CaCO3 Tolerance: Medium
Soil Description: Well-drained, sandy or gravelly soils.
Conditions Comments: Not Available
BenefitConspicuous Flowers: yes
PropagationDescription: Mountain dryas can be propagated by seed or root divisions. Make divisions in early spring. Seeds are slow and not too sure.
Seed Collection: Not Available
Seed Treatment: Cold, moist stratification for several months substantially increases germination.
Commercially Avail: yes
National Wetland Indicator Status
This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1
(Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here
for map of regions.
Record Last Modified: 2008-07-16
Research By: TWC Staff