Astragalus praelongus var. avonensis
Astragalus sect. Preussiani
avon milkvetch
few or several to many.
odd-pinnate, shortly subsessile to petiolate;
leaflets (1 or)3–33, jointed (terminal leaflet sometimes decurrent in A. preussii).
loosely flowered, sometimes initially densely flowered, flowers ascending to deflexed, declined, or nodding.
11–14(–16) mm;
calyx lobes triangular-subulate, (0.8–)1–1.9(–2.8) mm;
corolla pale lemon yellow, keel immaculate.
pink to purple, magenta-purple, reddish purple, ochroleucous, white, or yellowish, banner recurved through 30–90°, keel apex round, obtuse, blunt, bluntly triangular, or bluntly rectangular.
tubes cylindric, sometimes base oblique or gibbous.
ellipsoid, 18–33 × 9–11 mm, puberulent;
stipe thick, to 1.5 mm.
persistent, sessile or subsessile to stipitate, erect, spreading, or declined, narrowly ellipsoid to broadly ovoid, oblong-ellipsoid, obovoid, or subglobose, scarcely swollen to strongly inflated, unilocular or subunilocular.
20–75(–84).
connate at proximal nodes (or completely amplexicaul) or distinct throughout.
usually distinct, rarely connate-sheathing at proximal nodes (in A. praelongus).
basifixed.
Astragalus praelongus var. avonensis
Astragalus sect. Preussiani
Variety avonensis is apparently a smaller version of var. praelongus, more or less isolated along the floor of the Escalante Valley in Beaver, Iron, and Millard counties, which was submerged until a few thousand years ago by a shallow arm of Pleistocene Lake Bonneville.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Species 10 (10 in the flora).
Section Preussiani consists of three subsections: subsect. Preussiani (M. E. Jones) Barneby (Astragalus beathii, A. crotalariae, A. cutleri, A. eastwoodiae, A. debequaeus, A. preussii); subsect. Pattersoniani M. E. Jones (A. pattersonii, A. praelongus); and subsect. Sabulosi Barneby (A. iselyi, A. sabulosus). Taxa in sect. Preussiani are distributed on seleniferous substrates.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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