Collected
13 May 1990.
Sonora, Mexico
Locality: 8.4 mi. S of Rayon (15.2 mi. N of Ures) on (unpaved) road from Rayon to Ures.
Environment description: Plants growing along small arroyo at base of low hills bordering small valley. Prosopis velutina, Acacia farnesiana, Celtis pallida, Ambrosia ambrosioides, and groves of Sabal uresana. Plants leafless, in full flower, with nearly mature p
Number of plants sampled: 4