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
For up-to-date information about California vascular plants, visit the Jepson eFlora.

APIACEAE

CARROT FAMILY

Lincoln Constance

Annual, biennial, perennial herb (rarely shrub, tree), often from taproot
Stem often ± scapose, generally ribbed, hollow
Leaves basal and generally some cauline, generally alternate; stipules generally 0; petiole base generally sheathing stem; blade generally much dissected, sometimes compound
Inflorescence: umbel or head, simple or compound, generally peduncled; bracts present (in involucres) or not; bractlets generally present (in involucels)
Flowers many, small, generally bisexual (or some staminate), generally radial (or outer bilateral); calyx 0 or lobes 5, small, atop ovary; petals 5, free, generally ovate or spoon-shaped, generally incurved at tips, generally ± ephemeral; stamens 5; pistil 1, ovary inferior, 2-chambered, generally with a ± conic, persistent projection or platform on top subtending 2 free styles
Fruit: 2 dry, 1-seeded halves that separate from each other but generally remain attached for some time to a central axis; ribs on each half 5, 2 marginal and 3 on back; oil tubes 1–several per interval between ribs
Genera in family: 300 genera, 3,000 species: ± worldwide, especially temp; many cultivated for food or spice (e.g., Carum, caraway; Daucus; Petroselinum); some highly toxic (e.g., Conium). Underground structures here called roots, but true nature remains problematic. Mature fruit generally critical in identification; shapes generally given in outline, followed by shape in X -section of 2 fruit halves together.

SPHENOSCIADIUM


Species in genus: 1 sp
Etymology: (Greek: wedge umbrella, from umbel)

Native

S. capitellatum A. Gray

SWAMP WHITE HEADS, RANGER'S BUTTONS

Perennial, ± scabrous; root tuberous
Stem erect, 5–18 dm, generally branched, leafy
Leaf: petiole 1–4 dm; blade 1–4 dm, oblong to ovate, 1–2-pinnate or ternate then pinnate, leaflets 1–12 cm, generally ± lanceolate, acute, sparsely toothed to irregularly cut or pinnately lobed; cauline leaf sheaths conspicuously enlarged
Inflorescence: umbels compound, tomentose; peduncle 7–40 cm; bracts 0; bractlets many, linear, bristle-like; rays 4–18, 1.5–10 cm, ascending to reflexed; pedicels reduced to a disk; 2° umbels head-like, spheric
Flower: calyx lobes 0; petals obovate, white or purplish, tips narrowed; styles slender
Fruit 5–8 mm, wedge-shaped-obovate, very compressed front-to-back, tomentose; ribs unequally winged, marginal wider than others; oil tubes per rib-interval 1; fruit axis divided to base
Seed: face ± flat
Chromosomes: 2n=22
Ecology: Wet meadows, streamsides, lakeshores
Elevation: 900–3000 m.
Bioregional distribution: Inner North Coast Ranges, Cascade Range, High Sierra Nevada, Southwestern California, Great Basin Floristic Province
Distribution outside California: to Oregon, Idaho, Nevada, Baja California
Flowering time: Jul–Aug
TOXIC to livestock, but rarely eaten
Horticultural information: WET: 1, 2, 6, 7, 14, 15, 16; DFCLT.

previous taxon | next taxon
bioregional map for SPHENOSCIADIUM%20capitellatum 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 Sphenosciadium capitellatum
Retrieve dichotomous key for Sphenosciadium
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
Glossary
    FEEDBACK
  • This page is no longer being maintained.


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