Collected
16 August 1990.
Tamaulipas, Mexico
Locality: Hwy 70, 7.4 mi. S of the Tropic of Cancer (monument), S of Jaumave, Valley of Juamave.
Environment description: Rocky limestone soil of slope with Acacia berlandieri, A. rigidula, Leucophyllum frutescens, Morchillia acuminata, Cordia boissieri, Jatropha dioica var. dioica, Agave lophantha, Echinocactus ingens.
Number of plants sampled: 7