|Prickly poppy, Argemone sp.|
Prickly poppies are common roadside plants, with large showy white flowers. After the petals fall, and the plant turns brown and dry, the interesting structure of the capsules becomes apparent. A prickly poppy capsule opens by splitting from the apex down about ⅓ of its length, producing segments called valves. The valves spread to reveal a framework of dried vascular tissue, joined at the top by the persistent style and stigma (female flower parts).
|Wild buckwheat, Eriogonum sp. The diffuse inflorescence is roughly 30 cm across.|
Within the buckwheat inflorescence, flowers are clustered in cup-shaped structures called involucres. In the next photos, dried white-and-pink flowers emerge from the pendant involucres. Each flower contains an achene—a single seed wrapped in dried tissue of the ovary.