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Iva axillaris
Iva axillaris
Pursh
(redirected from:
Iva axillaris var. robustior
Hook.)
Family:
Asteraceae
Deer-Root,
more...
povertyweed, Iva poverty weed, lesser marshelder, mouseear pvertyweed, poverty sumpweed, poverty weed, smallflowered marshelder
[
Iva axillaris subsp. robustior
(Hook.) Bassett,
more
Iva axillaris var. robustior
Hook.
]
FNA
Resources
John L. Strother in Flora of North America (vol. 21)
Perennials,
10-40(-60) cm (rhizomatous).
Stems
erect (usually herbaceous).
Leaves:
petioles 0-3 mm; blades narrowly ovate or obovate to elliptic or spatulate, 15-25(-45) × 3-8(-15) mm, margins rarely toothed, faces usually ± strigose to scabrellous, gland-dotted.
Heads
in ± racemiform arrays.
Peduncles
1-2 mm.
Involucres
± hemispheric, 2-3 mm.
Phyllaries:
outer 3-5 ± connate, ± herbaceous.
Paleae
linear, 1.5-2 mm.
Pistillate florets
3-5(-8); corollas 0.5-1.5 mm.
Functionally staminate florets
4-8(-20+); corollas 2-2.5 mm.
Cypselae
2.5-3 mm.
2
n
= 36, 54.
Flowering May-Oct. Seasonally wet, saline habitats; 10-2500 m; Alta., B.C., Man., Sask.; Ariz., Calif., Colo., Idaho, Kans., Minn., Mont., Nebr., Nev., N.Mex., N.Dak., Okla., Oreg., S.Dak., Tex., Utah., Wash., Wis., Wyo.
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