Jepson Flora Project: Jepson Interchange    

link to manual TREATMENT FROM THE JEPSON MANUAL (1993) previous taxon | next taxon
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. transversa Suksd.

Plant 15–55 cm
Leaves: basal 6–18 cm, 10–40 mm wide
Inflorescence 7–26 cm, open to dense
Flower: sepals and lateral petals white to yellowish with green midvein; upper sepal pointed forward; lateral petals spreading and ± curved back; lip 2.5–5 mm, oblong to ± ovate, pointed forward or down, white; spur 6–10 mm, generally straight, pointed back
Chromosomes: n=21
Ecology: Generally dry sites, scrub, mixed-evergreen or coniferous forest
Elevation: < 2600 m.
Bioregional distribution: Northwestern California, Sierra Nevada, Central Western California, Transverse Ranges, Peninsular Ranges
Distribution outside California: to British Columbia

previous taxon | next taxon
bioregional map for PIPERIA%20transversa being generated

Retrieve Jepson Interchange Index to Plant Names entry for Piperia transversa
Retrieve dichotomous key for Piperia
Overlay Consortium of California Herbaria specimen data by county on this map
Show other taxa with the same California distribution | Read about bioregions | Get lists of plants in a bioregion
Return to the Jepson Interchange main page
Return to treatment index page

University & Jepson Herbaria Home Page |
General Information | University Herbarium | Jepson Herbarium |
Visiting the Herbaria | On-line Resources | Research |
Education | Related Sites
Copyright © by the Regents of the University of California