Flora of North America species comparison

erect to decumbent and spreading, usually much-branched, hispid and setose, sometimes also puberulent.

erect, sparsely branched, dark purple-red-glandular-setose, glandular-viscid.

opposite, subsessile or sessile;

petiole 0–2 mm;

blade broadly elliptic to lanceolate, 12–55 × 5–25 mm, base attenuate.

opposite, petiolate proximally, sessile distally;

petiole 1–10[–22] mm;

blade ovate to lanceolate, 10–35[–50] × 3–15[–20] mm, base rounded to cuneate.

leafy.

leafy.

1–2 mm.

(1–)4–6 mm.

alternate, 1 interpetiolar, with 1–3 flowers on axillary branchlets;

floral tube purple adaxially and distally, or green throughout, 4–6 × 1–1.5 mm, glabrous except veins sparsely and coarsely setose;

base rounded or a descending spur, 0.5 mm;

inner surface glabrous;

epicalyx segments thick, often terminated by a bristle;

sepals equal;

petals 6, deep purple or rose purple, subspatulate, subequal, 1.5–2.5 × 0.5–1 mm;

stamens 11, extending 2/3 distance to sinus of sepals.

alternate, solitary and interpetiolar, (with 2 or 3 axillary);

floral tube pale abaxially, purple-red to purple-black with dark veins adaxially, 5–11 × 1 mm, purple-red-glandular-setose;

base rounded [or a descending spur], to 0.5 mm;

inner surface glabrous proximally, lightly villous to glabrous distal to stamens;

epicalyx segments thick, 2 flanking the adaxialmost sepal terminated by a bristle;

sepals unequal, adaxialmost longer;

petals 6, purple or rose [bicolor, with white abaxial petals], obovate to orbiculate, unequal, 4 abaxial 0.5–1[–2.5] × 0.2 mm, 2 adaxial 1–2[–5] × 0.7 mm;

stamens 11, reaching or surpassing sinus of sepals.

(4–)6(–9), elliptic to suborbiculate in outline, 1.5–1.7 × 0.2–1.5 mm, margin narrow, flattened, thin.

3–6 [or 7], oblong-elliptic in outline, 2–2.5 × 1.8–2 mm, margin rounded.

= 16.

= 20 (Mexico), 44 (Mexico).