Piperia yadonii R. Morgan & Ackerman
Family: Orchidaceae
Yadon's piperia
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Plants 10-50(-80) cm. Stems attenuate toward tuberoid, 0.5-3.5 mm diam.; bracts (4-)7-20(-26). Leaves prostrate; blade 11-17 × 2.2-3.9 cm. Inflorescences densely flowered, cylindric, (2-)5-15(-30) cm; rachis shorter than peduncle; bracts (3-)5-8(-11) mm. Flowers green and white, fragrance faint, harsh to honeylike, diurnal; sepals 3-5.5 × 1-2.5 mm; dorsal sepal green with white margins, elliptic-lanceolate; lateral sepals spreading to recurved, white, lanceolate; petals erect-recurved, green with broad outer, narrow inner white borders, lanceolate, falcate, 3-5 × 1.5 mm, inner margins often forming U, apices often connivent; lip recurved, triangular-lanceolate, 2.5-5 × 1.2-2.5 mm; spur deflexed, 2-5 mm; viscidia ovate to broadly elliptic, 0.4-0.5 × 0.3-0.4 mm; rostellum blunt. Capsules 5-9 mm. Seeds cinnamon brown. Flowering late May--early Aug. Monterey pine forest, maritime chaparral; of conservation concern; 0--150 m; Calif. Piperia yadonii, a narrow endemic (Monterey Bay area), bears a superficial resemblance to P. elegans. Much of the P. yadonii habitat has been preempted for residential and golf course development.

The National Science Foundation
This project made possible by National Science Foundation Award 1410069