Flora of North America species comparison

erect, incurved ascending.

(1.5–)2–8(–9)[15–21] cm;

petiole (1.5–)2–7 mm;

extrafloral nectary 1(or 2), near mid petiole, stipitate;

leaflets (6–)8–28(–32)[–40] pairs, blades usually straight, sometimes falcate, linear, narrowly oblong, or oblong-elliptic, (3–)4–26 × 1–3 mm.

1(or 2)-flowered, axillary.

0.5–4[–16] mm;

bracteoles mid pedicel.

calyx greenish, sepal venation reticulate;

corolla yellow, sometimes fading pinkish, petals to 3.5–8(–9)[–16] mm;

stamens [2–]4–8[or 9];

anthers yellow-orange or red, to (1.4–)1.6–3[–9.5] mm, different sizes;

ovary usually hairy throughout, rarely glabrate.

straight, linear-oblong, [14–](15–)18–48(–56)[–78] × [2.4–]2.5–5.5(–5.8) mm.

[1.9–](2.2–)2.4–3.4[–3.7] mm.

exclusively Mexican varieties, var. macdougaliana (Rose) H.

.;

s .

& Barneby and var. potosina (Britton & Rose) H.;

irwin & Barneby, are distinguished from var. greggii by leaflet venation and number of pairs and length of leaflets.

vars. greggii and macdougaliana commonly have three or more pairs of leaflets, and the leaflets are to 11 mm, var. potosina usually has exactly two pairs which are to 11–17 mm.

to var. greggii, the inner primary leaflet vein on the proximal side of midrib is longer in var. macdougaliana, that is, to or beyond the middle of the leaflet blade, and the tertiary venation is absent.