Flora of North America species comparison

internodes 4-lined at first, then terete.

internodes terete (not lined) or 2-, 4-, or 6-lined at first (lines usually raised), then sometimes becoming angled, terete, or winged;

bark smooth or striate, sometimes corky, punctiform.

blades narrowly oblong or narrowly elliptic-oblong to triangular-lanceolate, 15–40 × 2–10 mm, base not articulated, cuneate to subcordate, margins recurved, apex subacute to rounded, midrib with 1 pair of branches.

corymbiform to cylindric, (7–)15–65-flowered, narrowly branched, sometimes with 3–65-flowered dichasia from 1–2 proximal nodes and relatively short, flowering branches from further 1–4 nodes.

terminal, cymose, 2+-flowered, or flowers solitary, branching stellate [cupulate];

sepals persistent or deciduous, (3–)4–5, distinct or ± connate, margins sometimes glandular-ciliate;

petals persistent or deciduous, (3–)4–5[–6], contorted, yellow to orange, sometimes red-tinged;

stamens persistent or deciduous, (5–)10–300(–650), in continuous or interrupted ring or in (3–)4–5 fascicles, fascicles distinct or connate, each with 1–60+ stamens;

filaments distinct or basally connate;

anthers yellow to orange, oblong to ellipsoid, almost isodiametric, sometimes with amber or black gland on connective;

staminode fascicles 0 [3];

ovary 2–5-merous;

placentation axile to parietal;

ovules 2+ on each placenta;

styles distinct or ± connate basally, spreading to ± appressed.

7–12 mm diam.;

sepals persistent, not enclosing capsule, 5, obovate or broadly elliptic to oblong, unequal, 2–4 × 1–1.7 mm;

petals 5, bright yellow, oblanceolate, 5–8 mm;

stamens (some or all) persistent, 30–50;

ovary 3-merous, placentation parietal.

ovoid-cylindric to broadly ovoid, 4–6 × 3–4 mm.

2–5-valved, sometimes with glandular vittae or vesicles.

not carinate, 0.6 mm;

testa reticulate to linear-foveolate.

narrowly cylindric to ellipsoid, sometimes carinate;

testa foveolate or reticulate to scalariform [papillose].

= 12, 9–7, 6 (dihaploid).

= 18.