Plagiobothrys collinus is an annual herb with a spreading or erect stem 10–40 centimetres (3.9–15.7 in) in length. The leaves along the stem are 1 to 4 centimeters long, the lower ones oppositely arranged and the upper ones alternate. The herbage is coated in fine and rough hairs.
The inflorescence is a long, widely spaced series of tiny flowers, each with a five-lobed white corolla no more than 7 millimeters wide, sometimes as small as one millimeter. The bloom period is February through May.
The fruit is a minute nutlet with angular cross-ribs visible in magnification.
- Plagiobothrys collinus var. californicus — California popcorn flower, primarily Peninsular Ranges in California and Baja California (México).
- Plagiobothrys collinus var. fulvescens — California popcornflower, rusty haired popcorn flower, native to California chaparral and woodlands habitats in California and Baja California.
- Plagiobothrys collinus var. gracilis — Graceful popcorn flower, endemic to coastal sage scrub in Southern California, including the Channel Islands.
- Plagiobothrys collinus var. ursinus — Northern popcorn flower, native to eastern Transverse Ranges and Peninsular Ranges in southern California and northwestern Baja California.
- Calflora Database: Plagiobothrys collinus (Cooper's popcornflower)
- Jepson Manual eFlora (TJM2) treatment of Plagiobothrys collinus
- UC Photos gallery: Plagiobothrys collinus
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