Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California

  • Up-to-date information about California vascular plants is available from the Jepson eFlora.



Dieter H. Wilken and William F. Jennings

Perennial, terrestrial in CA, some nongreen, generally from rhizomes
Leaves linear to ± round or scale-like, generally sessile
Inflorescence: generally raceme or spike, bracted
Flower bisexual, bilateral, sometimes spurred; sepals generally 3, generally petal-like, generally free, uppermost generally erect; petals 3, lowest different ("lip"); stamen generally 1, fused with style and stigma into column, pollen generally sticky, generally removed as sessile anther sacs; ovary inferior, generally twisted 180° (so lip appears to be lowest perianth segment), 1-chambered, placentas 3, parietal; stigmas 3, generally under column tip
Fruit: capsule
Seeds very many, minute
Genera in family: ± 800 genera, ± 18,000 species: especially tropical (worldwide except deserts). Many cultivated for ornamental, especially Cattelya, Cymbidium, Epidendrum, Oncidium, Paphiopedalum; Vanilla planifolia fruits used as source of food flavoring
Reference: [Luer 1975 Orchids US and Can, NY Bot Garden; Coleman 1995 Wild Orchids of California, Cornell Univ.]
Nongreen plants derive nutrition through fungal intermediates.



Caudex tuber- or bulb-like, 1–4 cm, generally ovoid
Leaves: basal 2–5, linear to widely oblanceolate; cauline bract-like
Inflorescence: spike or raceme, generally cylindric; flower bract generally < flower
Flower: perianth white to green; sepals generally 2–5.5 mm, 1–2 mm wide, 1-veined, upper pointed forward to erect, lower free, spreading to reflexed; lateral petals ± = sepals, spreading to erect; lip pointed forward or down, spurred; column < lip
Fruit ascending to erect
Species in genus: ± 8 species: w North America
Etymology: (Charles V. Piper, Am botanist, 1867–1926)
Reference: [Morgan & Ackerman 1990 Lindleyana 5:205–211]
Some species difficult to separate; green-flowered species doubtfully distinct from P. unalascensis.


P. yadonii Rand. Morgan & Ackerman


Plant 10–50 cm
Leaves: basal generally 10–15 cm, 20–35 mm wide
Inflorescence (2)5–15(30) cm, dense
Flower: upper sepal green with white margin, ± erect; lower sepals white, midvein faintly green; lateral petals ± erect, ± curved, green with wide white margin; lip 2.5–5 mm, narrowly triangular, recurved toward spur, white; spur 2.5–4 mm, pointed down
Ecology: Generally sandy soil or sandstone, coastal scrub, Monterey-pine forest
Elevation: < 150 m.
Bioregional distribution: c Central Coast (n Monterey Co.).
See the CNPS Inventory for information about endangerment and rarity.
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bioregional map for PIPERIA%20yadonii being generated

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