Orobanche cooperi subsp. cooperi

Treatment appears in FNA Volume 17. Treatment on page 484. Mentioned on page 485.

Plants simple or branched, base sometimes enlarged. Leaves sometimes imbricate proximally; blade broadly lanceolate, 7–11 mm, apex obtuse. Inflorescences: bracts 8–11(–13) mm, apex not or only slightly reflexed. Corollas (15–)18–22 mm; palatal folds pubescent; abaxial lip 4–7 mm, adaxial lip erect, 5–9 mm, lobes with or without apiculate tooth. Anthers glabrous or sparsely villous, stalked glands present on dorsal surface, sometimes obscure, rarely absent. Stigmas peltate, crateriform, or bilaminar, rarely 2-lobed. 2n = 48, 72, 96.

Phenology: Flowering Jan–Apr.
Habitat: Sandy desert, dry washes.
Elevation: -50–1000 m.


Ariz., Calif., Nev., Mexico (Baja California, Sonora).


Subspecies cooperi is most abundant in the Sonoran Desert. A single specimen collected recently in Santa Cruz County, Arizona (Carnahan 1365, ARIZ, MO) is anomalous in habitat (oak woodland), elevation (1525 m), flowering time (August), and apparent host (Artemisia). The specimen has pale flowers but otherwise keys closest to subsp. cooperi.

Selected References


Lower Taxa

L. Turner Collins +, Alison E. L. Colwell +  and George Yatskievych +
(A. Gray) A. Heller +
Aphyllon cooperi +
Ariz. +, Calif. +, Nev. +, Mexico (Baja California +  and Sonora). +
-50–1000 m. +
Sandy desert, dry washes. +
Flowering Jan–Apr. +
Cat. N. Amer. Pl., +
Weedy +  and Illustrated +
Myzorrhiza cooperi +  and Orobanche ludoviciana var. cooperi +
Orobanche cooperi subsp. cooperi +
Orobanche cooperi +
subspecies +