Flora of North America species comparison

yellow, slender.

yellow, slender.

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, umbelliform;

bracts at base of clusters 1, at base of pedicels 0 or 1, ovate, membranous, margins entire, apex acute.

0–2 mm.

0.7–7 mm, papillate.

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.

4-merous, 3.5–4.5(–5) mm, membranous, perianth papillate;

calyx straw yellow, campanulate, 1/3–1/2 corolla tube length, divided 1/2 its length, not reticulate or shiny, lobes triangular-ovate, bases not overlapping, margins entire, midvein not carinate, apex acute;

corolla white, drying creamy white, 3–4 mm, tube cylindric, 1.5–2.5 mm, not saccate, lobes spreading to reflexed, lanceolate, equaling corolla tube, margins entire, often involute and appearing very narrow dry, apex acute, ± cucullate;

infrastaminal scales oblong, 1.3–2.1 mm, 1/2 corolla tube length, bridged at 0.4–0.8 mm, rounded, uniformly short-fimbriate, fimbriae 0.05–0.1 mm;

stamens exserted, shorter than corolla lobes;

filaments 0.3–0.6 mm;

anthers 0.4–0.6 × 0.3–0.4 mm;

styles filiform, 1.2–2.1 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, 1.5–2 × 1.6–1.9 mm, slightly thickened and raised around inconspicuous interstylar aperture, translucent, capped by withered corolla, dehiscence circumscissile.

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

2–4, angled, subglobose to broadly ellipsoid, 0.7–0.9 × 0.7–0.8 mm, hilum subterminal.