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Iva

Iva
Family: Asteraceae
Iva image
  • FNA
  • Gleason & Cronquist
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John L. Strother in Flora of North America (vol. 21)
Annuals, perennials, subshrubs, or shrubs, 10-350 cm. Stems usually erect, sometimes decumbent to sprawling, often freely branched. Leaves cauline; mostly opposite (distal sometimes alternate); petiolate or sessile; blades (1- or 3-nerved) deltate, elliptic, filiform, lanceolate, linear, obovate, ovate, spatulate, or trullate, margins entire or toothed, faces glabrous or ± scabrellous, often gland-dotted. Heads discoid or ± disciform, in (± bracteate) racemiform or spiciform arrays (heads 1-2 in axil of each bract, bracts sometimes leaflike). Involucres ± hemispheric or turbinate to campanulate or urceolate, 2-10+ mm diam. Phyllaries persistent, 3-15+ in 1-3+ series, distinct or ± connate, all ± herbaceous or inner scarious to membranous. Receptacles flat or convex to hemispheric; paleae cuneiform or spatulate to linear or setiform, ± membranous, sometimes all or partially wanting. Pistillate florets usually 1-8+, rarely 0; corollas whitish (inconspicuous), ± tubular. Functionally staminate florets 3-20+; corollas whitish to pinkish, funnelform, lobes 5, soon reflexed (filaments ± connate, anthers coherent or distinct). Cypselae plumply obovoid to pyriform, often ± obcompressed, sometimes scabrellous or hispidulous distally, usually ± gland-dotted; pappi 0. x = 18.

M. Bolick (1983), P. O. Karis (1995), and B. Miao et al. (1995, 1995b, 1995c) considered Iva in the sense of R. C. Jackson (1960) to include species that have closer relatives outside Iva in the broad sense than within. I agree and treat the extradited species in Chorisiva, Cyclachaena, Hedosyne, Leuciva, and Oxytenia.

Ivas are wind pollinated, are related to the ragweeds (Ambrosia spp.), and may be similarly associated with pollen allergies.

Records of Iva asperifolia Lessing from Florida are evidently based on specimens that are treated as members of I. angustifolia.

Vascular plants of NE US and adjacent Canada
Heads disciform, the pistillate fls few, with tubular or obsolete cor; invol of a few equal or imbricate, ±herbaceous bracts in 1-3 series; receptacle small, chaffy, its bracts commonly linear or spatulate, often subtending the pistillate as well as the staminate fls, these outer pales sometimes larger and more like the bracts of the invol; disk fls 6-20 in our spp., staminate, with undivided style, connate filaments, scarcely united anthers, and abortive or no ovary; achenes obovate, thick but somewhat compressed parallel to the invol bracts; pappus none; herbs or shrubs with opposite (or the upper alternate) lvs and small heads of greenish-white fls sessile or short pedunculate in the axils of the upper lvs or bracts (infl bractless in one sp.). 15, N. Amer.

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

©The New York Botanical Garden. All rights reserved. Used by permission.
Species within checklist: Sage-Grouse Preferred Forbs, NV
Iva angustifolia
Media resource of Iva angustifolia
Map not
Available
Iva annua
Media resource of Iva annua
Map not
Available
Iva asperifolia
Media resource of Iva asperifolia
Map not
Available
Iva axillaris
Media resource of Iva axillaris
Map not
Available
Iva caudata
Media resource of Iva caudata
Map not
Available
Iva cheiranthifolia
Media resource of Iva cheiranthifolia
Map not
Available
Iva ciliata
Media resource of Iva ciliata
Map not
Available
Iva corbinii
Media resource of Iva corbinii
Map not
Available
Iva dealbata
Media resource of Iva dealbata
Map not
Available
Iva frutescens
Media resource of Iva frutescens
Map not
Available
Iva hayesiana
Media resource of Iva hayesiana
Map not
Available
Iva imbricata
Media resource of Iva imbricata
Map not
Available
Iva microcephala
Media resource of Iva microcephala
Map not
Available
Iva texensis
Media resource of Iva texensis
Map not
Available
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