Flora of North America species comparison

petiole 0.5–3.5 mm;

blade ovate to elliptic, without marked size dimorphism, to 40 × 30 mm, base acute to rounded, margins usually crenate to serrate, sometimes small leaves entire, apex acute.

alternate [opposite], simple;

stipules absent;

petiole present or absent;

blade sometimes lobed, margins entire, serrate, dentate, or crenate;

venation pinnate, basal secondary veins commonly present.

35–65-flowered.

terminal, cymes, thyrses, racemes, panicles, or flowers solitary.

strongly bilaterally symmetric;

petals spatulate, 10–15 mm, claws postgenitally distally coherent, forming slitted corolla tube;

stamens exserted laterally through slits between petal claws.

bisexual, usually radially symmetric, rarely bilaterally symmetric (by bilateral symmetry of corolla, androecium, or gynoecium);

perianth and androecium epigynous;

hypanthium adnate to ovary proximally and free distally, or completely adnate to ovary;

sepals 5, radially symmetric, distinct or connate basally;

petals 5, radially or bilaterally symmetric, distinct or connate, sometimes postgenitally coherent;

nectary absent or present, distal on ovary;

stamens 5–150+, distinct, free or adnate to petal bases, bilaterally or radially symmetric;

anthers dehiscing by longitudinal slits;

staminodes absent or present, sometimes petaloid and petals appearing to be 6+;

pistil 1, 3–7-carpellate, ovary inferior, 1-locular, placentation parietal, subapical, or apical;

ovules 1–60+ per locule, anatropous (epitropous);

style 1;

stigma 1, 2–5(–7)-lobed (lobes usually as many as carpels, except in pseudomonomerous Gronovioideae).

capsules, dehiscence by apical valves [splitting longitudinally], or cypselae, sepals or sepals and petals persisting.

1–60+ per fruit.

= 46.