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.

absus appears to be known since 1640 from a plant in Egypt (probably cultivated), called the Absus of Prosper Alpinus.

origin of the species is unclear, as some authors consider it likely to be native in the Old World and introduced in the New World, where it occurs in scattered and discontinuous populations (H.

.

and R.

. Barneby 1977, 1982);

others argue that the status depends from the variety considered (R.

1987).