Pennellia tricornuta

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Pennellia tricornuta
Arabis tricornuta fruit lg.jpg

Critically Imperiled (NatureServe)
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Rosids
Order: Brassicales
Family: Brassicaceae
Genus: Pennellia
Species: P. tricornuta
Binomial name
Pennellia tricornuta
(Rollins) R. A. Price, C. D. Bailey & Al-Shehbaz

Pennellia tricornuta (formerly Arabis tricornuta)[1][2] is a species of flowering plant in the mustard family known by the common names Rincon Mountain rockcress and Chiricahua rockcress. It is endemic to Arizona in the United States, where it occurs in Cochise, Pima, and Santa Cruz Counties.[2][3]

This perennial herb grows 15 to 90 centimeters tall. It has lance-shaped, toothed basal leaves up to 9 centimeters long and linear leaves higher on the stem. It produces flowers with lavender petals and green or purple sepals. The fruit is a silique up to 6.5 centimeters long.[2]

This plant grows in rocky habitat, on slopes and roadsides, and under pines.[3]


  1. ^ Price, R. A., et al. (2001). Transfer of the cupulate-flowered Arabis microsperma and A. tricornuta to Pennellia (Brassicaceae). Novon 11(3) 337-40.
  2. ^ a b c Pennellia tricornuta. Flora of North America.
  3. ^ a b Arabis tricornuta. The Nature Conservancy.

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