Flora of North America species comparison

ascending to erect or, rarely, decumbent, usually unbranched, 0.3–1.7(–2.5) dm, densely pubescent.

usually ascending (prostrate in fruit), unbranched, 0.3–1.6 dm, moderately pubescent.

blade margins usually entire, sometimes weakly sinuate-dentate, surfaces densely pubescent.

blade margins pinnatifid or entire, surfaces moderately pubescent.

petals white, 4.4–6.9 × (1.9–)2.3–4.2 mm.

petals white or purple-tinged, (3–)4–5.6 × (1.3–)2–3.3(–3.8) mm.

often abortive, somewhat torulose, 0.8–1.2 mm wide when fully developed;

septum not fenestrate or split longitudinally.

usually fertile and fully developed, not or weakly torulose, (1–)1.2–1.8(–2) mm wide;

septum often fenestrate (with circular perforations at regular intervals longitudinally or with a narrow, elliptical, longitudinal split at base or both).

= 28.

= 42.