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.



David J. Keil, Family Editor and author, except as specified

Annual to tree
Leaves basal or cauline, alternate to whorled, simple to compound
Inflorescence: 1° inflorescence a head, each resembling a flower, 1–many, generally arrayed in cymes, generally subtended by ± calyx-like involucre; flowers 1–many per head
Flowers bisexual, unisexual, or sterile, ± small, of several types; calyx 0 or modified into pappus of bristles, scales, or awns, which is generally persistent in fruit; corolla radial or bilateral (rarely 0), lobes generally (0)4–5; stamens 4–5, anthers generally fused into cylinder around style, often appendaged at tips, bases, or both, filaments generally free, generally attached to corolla near throat; pistil 1, ovary inferior, 1-chambered, 1-seeded, style 1, branches 2, generally hair-tufted at tip, stigmas 2, generally on inside of style branches
Fruit: achene, cylindric to ovoid, generally deciduous with pappus attached
Genera in family: ± 1300 genera, 21,000 species (largest family of dicots): worldwide. Largest family in CA. Also see tribal key to CA genera: Strother 1997 Madroño 44(1):1–28. See glossary p. 25 for illustrations of general family characteristics.



Willard W. Payne

Annual to shrub
Leaves generally opposite below, ± alternate above
Inflorescence: heads many, disciform; involucre cup-shaped, shallow; phyllaries few, free or fused; receptacle chaffy
Pistillate flowers 0–6; corolla 0 or cylindric
Staminate flowers 5–20; corolla translucent; anthers free, yellow; style tip truncate or tack-shaped
Fruit obovate, ± compressed; pappus 0
Etymology: (Latin: from mint Ajuga iva , with similar aroma)
Reference: [Jackson 1960 Univ KS Sci Bull 41:793–876]


I. axillaris Pursh subsp. robustior (Hook.) Bassett


Perennial 1–6 dm, from rhizome
Stems green to brown
Leaves 1–4 cm, linear to obovate, entire, subsessile, ± red-gland-dotted
Inflorescence raceme-like; heads short-peduncled, nodding; involucre 5–6 mm; phyllaries ± fused; chaff scales linear
Pistillate flowers: corolla vestigial
Fruit plump, glabrous
Chromosomes: 2n=36,54
Ecology: Common. Many (saline) habitats
Elevation: < 2500 m.
Bioregional distribution: California
Distribution outside California: to British Columbia, Montana, c US, Texas
Flowering time: May–Sep

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bioregional map for IVA%20axillaris%20subsp.%20robustior 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 Iva axillaris subsp. robustior
Retrieve dichotomous key for Iva
Retrieve multiple-entry key (MEKA) for Iva
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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