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.

ASTERACEAE

SUNFLOWER FAMILY

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.

IVA

WORMWOOD

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]

Native

I. nevadensis M.E. Jones

Annual < 3 dm, from stout taproot, ill-scented
Stems yellow
Leaves 8–18 mm, 2-pinnately dissected (segments ± obtuse), ± glandular and white-strigose
Inflorescence: small cymes, leafy-bracted; heads erect; involucre 2–3 mm; phyllaries generally 3, free outer chaff scales wide, inner linear
Pistillate flowers: corolla short
Fruit glabrous; inner face flat or concave
Ecology: Alkaline, sandy plains
Elevation: 1000–2000 m.
Bioregional distribution: nw White and Inyo Mountains
Distribution outside California: w Nevada
Flowering time: Jun–Oct
Reference: [Bolick 1983 Advances in Cladistics 2:125–141]
See the CNPS Inventory for information about endangerment and rarity.
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bioregional map for IVA%20nevadensis being generated
 
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Retrieve Jepson Interchange Index to Plant Names entry for Iva nevadensis
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