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Marcus, Joseph A.
Thamnosma texana (Gray) Torr.
Dutchman’s breeches, Ruda del monte, Rue of the mountains, Texas desert-rue
USDA Symbol: THTE2
USDA Native Status: Native to U.S.
A low, aromatic plant with a woody base and thin, herbaceous stems up to 1 foot tall. Grows in open and brushy areas in shallow soil over limestone, more common west of the Hill Country. Leaves small, narrow, up to 3/4 inch long by 1/16 inch wide, dotted with glands visible under a 10x hand lens. Flowers small, 1/8 to 3/16 inch wide, arranged along the upper half of the stems, appearing from March to June. Fruit a 2 lobed capsule having an inflated appearance and giving rise to the name Dutchman Breeches.
Plant CharacteristicsDuration: Perennial Habit: Herb Fruit: Size Class:
Bloom InformationBloom Color: White , Yellow , Purple
Bloom Time: Mar , Apr , May , Jun
AZ , CO , NM , TX Native Habitat:
Rocky meadows and slopes over limestone in the Edwards Plateau, into south Texas and west to Trans-Pecos Texas. Loam, sand, limestone. USDA Native Status: L48(N)
Growing ConditionsWater Use: Low
Light Requirement: Sun
Soil Moisture: Dry
BenefitFragrant Flowers: yes
Fragrant Foliage: yes
Larval Host: Eastern Black Swallowtail.
Deer Resistant: Moderate
Butterflies and Moths of North America (BAMONA)
is a larval host and/or nectar source for:
PropagationPropagation Material: Softwood Cuttings
Description: Cut new growth when most tender, before budding in spring, also can have new growth in fall.
Herbarium Specimen(s)NPSOT 0192
Collected Mar. 15, 1992 in Comal County by Mary Beth White
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Record Modified: 2007-08-31
Research By: LAL, LAS