Flora of North America species comparison

alternate;

stipular glands absent or minute;

blade linear or narrowly oblong, 10–35 × 0.5–2(–2.5) mm, base flat, not clasping, margins without stalked glands.

alternate, opposite, or whorled, simple;

stipules absent or present as small, dark, spheric glands;

petiole usually absent, rarely present;

blade margins entire, serrate, or denticulate;

venation pinnate.

cymes monochasial (helicoid), open, internodes long, flowers widely scattered;

bract margins without prominent glands.

terminal, racemes, panicles, or cymes (rarely thyrses or corymbs in Linum) [spikes].

5–15(–25) mm, 5–25 mm in fruit, pendent in bud, deflexed at 90° angle, slightly bent at apex.

sepals erect, not reflexed at tip, ovate, 1.5–2.5(–3.5) mm, equal, margins minutely gland-toothed, surfaces glabrous;

petals widely spreading to reflexed, white or pale pink, usually darker-veined, obovate, 4–7 mm, apex obtuse;

cup white, rim petal attachments in indentations;

stamens exserted;

filaments (3–)4–5(–7) mm;

anthers pink to red-purple, white-margined, dehisced anthers 1.2–2 mm;

ovary chambers 6;

styles 3, white, 3.5–7 mm, exserted.

bisexual;

perianth and androecium hypogynous;

hypanthium absent;

sepals 4–5, connate basally [distinct];

petals 4–5, distinct or coherent basally, imbricate or convolute, bases sometimes with appendages;

nectary extrastaminal;

stamens 4–5 [10], connate basally, filament tube and petal bases adherent or adnate [free];

anthers dehiscing by longitudinal slits;

pistil 1, 2–5-carpellate, ovary superior, 4–5-locular, placentation axile or apical-axile;

ovules 2 per locule, anatropous;

styles 2–5, distinct or partly connate;

stigmas 2–5.

capsules, dehiscence septicidal, or indehiscent or schizocarps breaking into 4 nutlets (Sclerolinon).

2 per locule, seed coat often mucilaginous.

= 36.