Flora of North America species comparison

erect to ascending or decumbent.

erect, decumbent, or sprawling; unbranched.

1–8 cm;

leaflets 5–11, blade linear to ovate-elliptic, margins entire, irregularly toothed, or lobed.

alternate, simple or compound;

venation pinnate;

stipules absent;

petiole present;

blade margins entire or pinnately lobed, bipinnate, or ternate.

axillary, flowers solitary;

bracts absent.

present.

urn-, cup-, or bell-shaped;

sepals accrescent or not, ovate, obovate, lanceolate, oblong-lanceolate, or lanceolate-ovate, 4–10 mm;

petals white, obovate, oblong, or obovate-cuneate, 4.5–10 mm, 1.6–1.8 times as long as wide, 0.5–1.1 times longer than sepals, apex retuse, obtuse, erose, truncate, or emarginate;

filaments 2–7 mm;

anthers (yellow) 0.4–1.5 mm;

style 1.5–4 mm.

usually bisexual, usually actinomorphic, rotate;

perianth and androecium hypogynous;

sepals usually persistent, 3 or 5 (4 in Limnanthes macounii), distinct or slightly connate basally, equal or unequal;

petals same number as sepals, convolute in bud, distinct, equal;

nectary glands present;

stamens 3, 6, 8, or 10 (same or twice the number of sepals);

filaments distinct, glabrous;

anthers dehiscing by longitudinal slits, introrse or extrorse, tetrasporangiate, pollen shed in single grains, binucleate, 2–4-aperturate, colpate or colporate;

disc absent;

gynophore absent;

pistil 1;

ovary 2–5-carpellate, syncarpous basally (united by gynobasic style);

placentation basal;

ovules 1 per locule, anatropous, unitegmic;

style 1 (gynobasic);

stigmas (2 or) 3–5 (dry, papillate).

schizocarps (mericarps or nutlets), tuberculate, ridged, smooth, or rugulose.

1;

not arillate;

endosperm absent.

dark brown or gray, 3–4.5 mm, tuberculate, tubercles straw-colored, platelike, conic, or awl-shaped.