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Key to Antennaria

Asteraceae

Antennaria

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1
Flowering stalks with 1 head
 ⇒ Antennaria solitaria

(c) Fleming, Gary P.
1
Flowering stalks with 2 or more heads.

(c) Bradley, Keith
  2
Basal leaves prominently 3-5 (-7)-nerved, mostly > 1.5 cm wide.
    3
Involucres of pistillate heads 5-7 mm high; pistillate corollas 3-4 mm high; staminate corollas 2-3.5 mm high; basal leaves tomentose on the upper surface; young stolons mostly ascending; staminate and pistillate plants equally common
 ⇒ Antennaria plantaginifolia
    3
Involucres of pistillate heads (7-) 8-13 mm high; pistillate corollas 4-7 mm high; staminate corollas 3.5-5 mm high; basal leaves tomentose or glabrous on the upper surface; young stolons mostly decumbent; sexual and apomictic populations present.
      4
Basal leaves tomentose on the upper surface (becoming glabrate in age); summit of young cauline stem usually glandless
 ⇒ Antennaria parlinii ssp. fallax
      4
Basal leaves glabrous or nearly so on the upper surface (even when young); summit of young cauline stem usually with purple glandular hairs (at least when the stem is young, these withering and becoming less apparent as the stem ages)
 ⇒ Antennaria parlinii ssp. parlinii
  2
Basal leaves prominently 1-nerved (sometimes with 2 additional obscure veins), mostly < 1.5 cm wide.
    5
Young and mature basal leaves glabrous on the upper surface; phyllary tips whitish; flags (flat scarious appendages similar to the tips of phyllaries on the tip of the leaf) present on the upper cauline leaves; species apomictic, populations consisting of pistillate plants only
 ⇒ Antennaria howellii ssp. canadensis
    5
Young basal leaves pubescent on the upper surface, mature leaves either remaining pubescent or becoming glabrous with age; phyllary tips white, ivory, to light brown; flags present or absent on the upper cauline leaves; species apomictic or sexual.
      6
Largest basal leaves < 6.0 mm wide and < 20 mm long; pistillate involucres 4.5-7 mm high; species sexual, populations consisting of both pistillate and staminate plants; [of shale barrens from w. VA northward and westward]
 ⇒ Antennaria virginica
      6
Largest basal leaves > 6.0 mm wide and > 20 mm long; pistillate involucres 7-10 mm high; species apomictic or sexual; [collectively of various habitats and more widespread].
        7
Middle and upper cauline leaves tipped with flags; mature basal leaves glabrous, young basal leaves pubescent, glabrescent with age; species sexual, populations consisting of both pistillate and staminate plants
 ⇒ Antennaria neglecta
        7
Middle and upper cauline leaves blunt or with subulate tips (only those leaves immediately around the corymb with flags); mature and young basal leaves pubescent; species apomictic, populations consisting of pistillate plants only.
          8
Basal leaves spatulate, with a distinct petiole; stolons mostly 5-8 cm long, with leaves along the stolon almost equal in size to those of the terminal rosette
 ⇒ Antennaria howellii ssp. neodioica
          8
Basal leaves oblanceolate, lacking a distinct petiole; stolons mostly 8-12 cm long, with leaves along the stolon smaller than those of the terminal rosette
 ⇒ Antennaria howellii ssp. petaloidea