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| Jepson eFlora: Taxon page
Key to families | Table of families and genera |
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Indexes to all accepted names and synonyms: | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | |
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Shrub, tree; monoecious.
Stem: trunk < 35 m; bark smooth to scaly, peeling in thin layers or not, lenticels present or not.
Leaf: simple, alternate, petioled, deciduous; stipules deciduous; blade ovate to elliptic, generally serrate, generally ± doubly so.
Inflorescence: catkin, generally appearing before leaves, often clustered; bracts each subtending 2–3 flowers, 3–6 bractlets.
Staminate inflorescence: pendent, ± elongate.
Pistillate inflorescence: pendent or erect, developing variously in fruit (see key to genera).
Staminate flower: sepals 0–4, minute; petals 0; stamens 1–10; pistil vestigial or 0.
Pistillate flower: sepals 0–4; petals 0; stamens 0; pistil 1, ovary inferior or superior, chambers 2, each 1-ovuled by abortion, stigmas 2.
Fruit: achene, nut, winged or not, subtended or enclosed by 1–2 bracts.
6 genera, 155 species: generally n hemisphere; some cultivated. [Furlow 1997 FNANM 3:507–538] —Scientific Editor: Thomas J. Rosatti.
Key to Alnus
Stem: trunk < 35 m; bark smooth, gray to brown; twigs glabrous to fine-hairy, red-gray; lenticels small; winter buds stalked, 0–6-scaled.
Leaf: glabrous to fine-hairy; blade 3–15 cm, cordate to elliptic or diamond-shaped.
Staminate inflorescence: 5–20 cm; bracts each subtending 3 flowers, 4 bractlets.
Pistillate inflorescence: 5–20 mm; bracts each subtending 2 flowers, 4 fused bractlets.
Staminate flower: sepals 4; stamens 1–4.
Pistillate flower: sepals 0.
Fruit: many, in cone-like catkin, not enclosed by bract, winged, bracts 3 mm, woody, persistent.
± 25 species: n hemisphere, South America. (Latin: alder) Root nodules contain nitrogen-fixing bacteria; wood used for interior finishing, to smoke fish, meats.
Tree.
Stem: trunk < 25 m.
Leaf: blade thick, base rounded to tapered, tip acute, margin tightly rolled under, adaxially gray-green, midrib, major veins indented, abaxially ± gray-green, rusty-hairy, or with rusty, sessile glands.
Wet places, especially after logging; < 1000 m. North Coast, w Klamath Ranges, Outer North Coast Ranges, Central Coast, San Francisco Bay Area;
Previous taxon: Alnus rhombifolia
Next taxon: Alnus viridis
Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
Copyright © 2012 Regents of the University of California
We encourage links to these pages, but the content may not be downloaded for reposting, repackaging, redistributing, or sale in any form, without written permission from The Jepson Herbarium.
| Bioregions in which taxon occurs | Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues. |
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Chart based on elevation range in Manual and elevations and coordinates of CCH records. Data provided by the participants of the Consortium of California Herbaria. Note: About half of the CCH records include both elevation and coordinates. | Data provided by the participants of the Consortium of California Herbaria.
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