Flora of North America species comparison

alternate;

stipular glands very inconspicuous, present at proximal nodes, absent distally;

blade linear or narrowly oblong, 10–13(–20) × 2–2.5 mm, base flat, not clasping, margins without stalked glands.

alternate;

stipular glands present;

blade linear, (5–)15–25 × 1–1.5(–2) mm, base flat, not clasping, margins eglandular or glands minute.

cymes monochasial (scorpioid or helicoid), open, branches unequal (main axis obvious), internodes long, flowers widely scattered;

bract margins without prominent glands.

cymes monochasial, dense, sparingly branched, internodes sometimes all condensed or long proximally and condensed distally, flowers condensed at apices;

bract margins eglandular.

5–25 mm, scarcely longer in fruit, spreading at angles 70–80(–90)°, scarcely bent at apex.

0.5–2(–5) mm, scarcely longer in fruit, ascending, not bent at apex.

sepals erect or reflexed at tip, lanceolate, 1.5–2.5 mm, usually equal, sometimes one larger, marginal glands absent or minute, surfaces glabrous;

petals not or slightly spreading at anthesis, yellow, often with reddish or orange streak on midvein, oblanceolate, sometimes obovate, 0.5–2.5(–4) mm, apex notched or erose;

cup yellow, rim with petal attachment protruding prominently in sinus or strongly indented;

stamens included;

filaments 1–2 mm;

anthers yellow, dehisced anthers 0.5–0.8(–1.2) mm;

ovary chambers 6;

styles 3, yellow, 0.5–1(–1.8) mm, included.

sepals erect, ± reflexed at tip, lanceolate, 3–4 mm, equal, margins minutely glandular, surfaces hairy, hairs intertwined or matted;

petals ± reflexed, pink to rose, oblanceolate, (3–)6–7(–8) mm, apex obtuse, sometimes slightly notched;

cup white, rim with petal attachments set in deep notches between filaments;

stamens exserted;

filaments 4–5 mm;

anthers rose to purple, dehisced anthers 1.5–2 mm;

ovary chambers 6;

styles 3, white, (3–)4–4.5(–5) mm, exserted.

= 36.

= 36.