Jepson Flora Project: Jepson Interchange    

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

Perennial, stem- or root-parasites lacking chlorophyll, generally monoecious or dioecious
Stem reduced to thread-like tissue underground or inside host stem
Leaf scale-like
Inflorescence: short spike or flower solitary
Flower generally unisexual, radial, fleshy; sepals 4–16, often fused at base; petals 0; stamens 5–many, fused to style axis forming a column that is generally expanded at tip into a disk with stigmatic areas or stamens along or under margin; ovary ± inferior, chambers 1–several, placentas parietal
Fruit various, generally fleshy
Seeds many, minute
Genera in family: ± 8 genera ± 50 species: worldwide, especially tropical. Poorly known taxonomically. Rafflesia species have world's largest flowers (1 m diam); Pilostyles flowers are < 2 mm diam.


Perennial, stem parasites
Stem appearing 0
Leaves reduced to bracts subtending flower
Inflorescence: flower solitary
Flower minute; sepals 4–5
Staminate flower: anthers many, sessile on column under margin of disk
Pistillate flower: ovary inferior, chamber 1, stigmas in ring along disk margin
Fruit: fleshy capsule
Species in genus: 20 species: tropical Am, Africa, Australia, sw Asia (especially Iran)
Etymology: (Latin: hair pillar, from the central column)
Only flowers and bracts are visible on surface of host stem.

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bioregional map for PILOSTYLES being generated
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Pilostyles
Retrieve dichotomous key for Pilostyles
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
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