99.
Boechera stricta
(Graham) Al-Shehbaz, Novon. 13: 389. 2003.
Turritis stricta
Graham, Edinburgh New Philos. J. 7: 350. 1829;
Arabis connexa
Greene;
A. drummondii
A. Gray;
A. drummondii
var.
connexa
(Greene) Fernald;
A. drummondii
var.
oxyphylla
(Greene) M. Hopkins;
A. oxyphylla
Greene;
Boechera angustifolia
(Nuttall) Dorn;
B. drummondii
(A. Gray) Á. Löve & D. Löve;
Erysimum drummondii
(A. Gray) Kuntze;
Streptanthus angustifolius
Nuttall;
T. drummondii
(A. Gray) Lunell
Biennials or perennials;
usually short-lived; sexual; caudex usually not woody.
Stems
usually 1-4 per caudex branch, usually arising from center of rosette near ground surface, rarely arising laterally proximal to sterile shoots, 1.5-8(-10.2) dm, glabrous or sparsely pubescent proximally, trichomes sessile, usually 2-rayed, rarely simple, 0.3-0.7 mm, glabrous distally.
Basal leaves:
blade oblanceolate, 1.5-8(-14) mm wide, margins usually entire, rarely dentate, ciliate, trichomes (sessile, usually 2-rayed, rarely simple ones at petiole base), surfaces usually pubescent, sometimes glabrous, trichomes sessile, 2-rayed (malpighiaceous), 0.3-0.7 mm.
Cauline leaves:
6-52, concealing stem proximally; blade auricles 0.5-3 mm, surfaces of distalmost leaves glabrous.
Racemes
8-35(-80)-flowered, usually unbranched.
Fruiting pedicels
erect, straight, 5-18 (-25) mm, glabrous.
Flowers
erect at anthesis; sepals glabrous; petals white (usually aging pale lavender), (5-)7-11 × 1.5-2.7 mm, glabrous; pollen ellipsoid.
Fruits
erect, appressed to rachis, not secund, straight, edges parallel, 4-9(-10.2) cm × 1.5-3.5 mm; valves glabrous; ovules 110-216 per ovary; style 0.05-0.3 mm.
Seeds
biseriate, 1.3-2.2 × 1-1.6 mm; wing lateral and distal, 0.3-0.8 mm wide.
2
n
=
14.
Flowering May-Aug. Rocky slopes and gravelly soil in sagebrush and mountain shrub communities, open conifer and hardwood forests, alpine meadows; 700-3900 m; Alta., B.C., N.W.T., Que., Sask., Yukon; Alaska, Ariz., Calif., Colo., Idaho, Iowa, Maine, Mass., Mich., Minn., Mont., Nev., N.H., N.Mex., N.Dak., Ohio, Oreg., R.I., Utah, Vt., Wash., Wis., Wyo.
Arabis drummondii
is the correct name for this species in that genus; the epithet
stricta
has priority in
Boechera
. This very distinctive species is easily recognized by having basal leaves with branched trichomes, all sessile and 2-rayed (malpighiaceous). It is also the most promiscuous, having formed apomictic hybrids with at least 15 other species of
Boechera
.
