Errazurizia rotundata
roundleaf dunebroom
repeatedly branched, gnarled at maturity, bearing numerous raised, orange or brownish glands when young, strigulose or cinereous.
3–14 cm;
stipules caducous or persistent, subulate, linear, or triangular;
leaflet blade 1–8 mm, diminishing distally, apex emarginate, surfaces with scattered, raised glands abaxially.
0–1 cm.
relatively dense;
axes 4–15 mm;
bracts caducous, lanceolate-acuminate or subulate, 1.6–2.5 mm.
calyx subactinomorphic, 5–6.5 mm, thinly pilose, tube 3.5–4.2 mm, 10-ribbed, not anastomosing into arches distally, regions between ribs each with a row of 2–5 raised glands, lobes oblong-obovate, apex obtuse or gland-apiculate;
banner, when present, erect, pale yellow, fading reddish, oblanceolate, 5–5.4 × 1.5–2.1 mm;
stamens strongly exserted, (7–)8.5–12 mm;
filaments distinct to 8 mm (from basal tube);
anthers 1–1.3 mm;
style usually glabrous.
mostly tan, 9–12 mm;
valves becoming papery.
chestnut, somewhat compressed, (4.6–)5–7 mm.
Errazurizia rotundata
Errazurizia rotundata is known only from two limited areas near Tuba City, Coconino County, and Winslow, Navaho County, in northeast Arizona; it differs from congeners by its reduced or absent corolla, its exserted, 10-merous androecium, and its larger leaflet number. The species was described initially in the genus Parryella; R. C. Barneby (1977) noted that it combines characteristics of that genus and Psorothamnus. Molecular and morphological studies by M. McMahon (2005) and S. C. K. Straub and J. J. Doyle (2014) have shown it to be closer to Parryella filifolia and Amorpha species than to other species of Errazurizia but have not resolved its placement; see the discussion under 61. Amorpha.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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