Flora of North America species comparison

yellow, slender.

white to creamy yellow, medium.

loose, umbelliform;

bracts at base of clusters 1, at base of pedicels and/or flowers 0 or 1, ovate-lanceolate, membranous, margins entire, apex acute.

loose to moderately dense, paniculiform or corymbiform;

bracts at base of clusters 1, at base of pedicels 0 or 1, ovate-triangular to lanceolate, membranous, margins entire or serrulate-denticulate, apex obtuse to acute.

0–2 mm.

1.5–6 mm.

4- or 5-merous, 2.8–3.3 mm, membranous, not papillate;

calyx slightly zygomorphic, creamy yellow, broadly campanulate, 1-1/3–1-1/2 corolla tube length, divided 1/2–3/5 its length, not reticulate or shiny, lobes ovate, bases not overlapping, margins entire, midvein not carinate, apex long-attenuate;

corolla white, drying creamy yellow, 2.6–3 mm, tube campanulate, 1.2–1.5 mm, not saccate, lobes suberect, triangular-ovate, longer than corolla tube length, margins entire, apex lance-attenuate, straight;

infrastaminal scales relatively poorly developed, oblong, 0.6–1 mm, 1/2–3/4 corolla tube length, bridged at 0.2–0.3 mm, usually reduced to denticulate wings, rarely 2-fid with 1–3 fimbriae on each side of filament attachments, 0.1–0.2 mm;

stamens included or barely visible through corolla sinuses, shorter than corolla lobes;

filaments 0.2–0.5 mm;

anthers 0.2–0.4 × 0.2–0.3 mm;

styles terete to slightly subulate, 0.3–0.7 mm, 1/4 ovary length.

5-merous, 3.5–4.5 mm, membranous, not papillate;

calyx yellow, cupulate, 3/4 to ± equaling corolla tube length, divided 1/2–2/3 its length, finely reticulate, shiny, lobes orbiculate to oblong-obovate, bases overlapping, margins minutely erose or denticulate, membranous, midvein carinate, apex ± truncate, each not exceeded by a hornlike appendage, 0.1–0.2 mm;

corolla creamy white, drying creamy white to reddish brown, 3.2–4 mm, tube campanulate, 1.5–2.2 mm, not saccate, sometimes with horizontal ridges between stamen attachments, lobes erect or spreading to reflexed, oblong-obovate to orbiculate, shorter than to equaling corolla tube length, margins minutely erose or denticulate, membranous, midvein unevenly carinate, apex ± truncate, each with a hornlike appendage 0.1–0.2 mm, not exceeding apex, straight;

infrastaminal scales oblong to ± truncate, 1.5–2 mm, 3/4 to equaling corolla tube length, bridged at 0.4–0.6 mm, uniformly densely fimbriate, fimbriae 0.2–0.4 mm;

stamens exserted, shorter than corolla lobes;

filaments 0.4–1 mm;

anthers 0.7–1 × 0.4–0.5 mm;

styles stout, subulate, 1.8–3.2 mm, longer than ovary.

ellipsoid-ovoid, ovoid-conic, or globose to depressed-globose, 2–3.2 × 2–3.6 mm, not thickened or raised around relatively small interstylar aperture, translucent, proximal 1/2 surrounded by withered corolla, indehiscent.

globose, 2–2.5 × 2.2–2.5 mm, thickened, not raised around inconspicuous interstylar aperture, not translucent, withered corolla near middle or apical, dehiscence circumscissile.

2–4, obcompressed, subglobose, 0.8–1.1 × 0.8–1 mm, hilum subterminal.

1–4, angled, subglobose to ovoid, 0.9–1.4 × 0.8–1.3 mm, papillate, hilum region terminal.