Greene, Pittonia. 3: 286. 1898.
Rocky Mountain pussytoes
(Linnaeus) Gaertner var.
E. E. Nelson;
E. E. Nelson
Dioecious or gynoecious
(staminate plants rare or in equal frequency to pistillates, respectively).
1-nerved, spatulate to oblanceolate, 6—19 × 2.5—6 mm, tips mucronate, faces gray-pubescent.
linear, 5—20 mm, not flagged (apices acute).
2—5(—9) in corymbiform arrays.
staminate (3.5—)4.5—6.5 mm; pistillate 4—8 mm.
distally dark brown, black, or olivaceous.
staminate 2.5—4.5 mm; pistillate 3—4.5 mm.
0.6—1.6 mm, glabrous or papillate;
staminate 2.5—4.5 mm; pistillate 4—5.5 mm.
= 56, 98, 112.
ranges from Arizona to Alaska; dioecious and gynoecious populations are encountered (R. J. Bayer and G. L. Stebbins 1987). The dioecious (sexual) populations are restricted primarily to California and Oregon (Bayer et al. 1990). The main distinction between
is flags on distal cauline leaves present in
and mostly absent in
(Bayer 1990d). Phyllaries of the pistillate plants in
tend to be acute; they are blunter in
. At some point, it may be preferable to follow W. L. Jepson ([1923—1925]) and some later authors and treat
as a subspecies of
appears to be an autopolyploid derivative of
; genes from
may have introgressed into the
complexes indirectly through
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