Tragia ramosa
Tragia amblyodonta
branch noseburn, branch or desert or common noseburn, desert noseburn, desert tragia
blunt-tooth noseburn, dog-tooth noseburn
erect to trailing, dark green to light green, apex rarely flexuous.
erect to trailing, gray-green, apex often flexuous.
petiole 2–20 mm;
blade linear-lanceolate to narrowly ovate, 1–4 × 0.5–2 cm, base truncate to weakly cordate, margins serrate, apex acute.
petiole 4–20(–30) mm;
blade usually triangular to subhastate, sometimes ovate, 1–4.5 × 0.8–3 cm, base cordate, hastate, or truncate, margins crenate to serrate, apex acute to obtuse.
terminal (often appearing leaf opposed), glands few, sessile, staminate flowers 2–20 per raceme; staminate bracts 1.5–2 mm.
terminal or axillary, glands absent, staminate flowers 5–16 per raceme; staminate bracts 0.9–2 mm.
staminate 0.7–2 mm, persistent base 0.4–1.5 mm; pistillate 2–2.5 mm in fruit.
staminate 0.7–1.2 mm, persistent base 0.2–0.8 mm; pistillate 1.5–4 mm in fruit.
sepals 3–4, green, 1–2.2 mm;
stamens 3–6(–10), filaments 0.3–1 mm.
sepals 3–4, green, 0.9–1.2 mm;
stamens 3–4, filaments 0.2–0.7 mm.
sepals lanceolate, 0.8–2.5 mm;
styles connate 1/3–1/2 length, long-exserted;
stigmas smooth to undulate.
sepals lanceolate, 1–2.5 mm;
styles connate to 1/3 length, short-exserted;
stigmas undulate to subpapillate.
6–8 mm wide.
7–8 mm wide.
dark brown, 2.5–3.5 mm.
brown with tan mottling, 2.5–3.5 mm.
= 44.
= 110.
Tragia ramosa
Tragia amblyodonta
Tragia ramosa is a variable species showing much environmental plasticity. Collections from the western United States and western Mexico have much broader leaves than those from Texas and Nuevo León, and were previously referred to as T. stylaris. Smooth stigmatic surfaces, three to six (rarely to ten) stamens, and narrow apical leaves are characters consistent with T. ramosa.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Tragia amblyodonta is easily distinguished from other members of Tragia by the combination of usually triangular to subhastate leaf blades, gray-green coloration, and painfully stinging hairs. Both stomata diameter and pollen grain size of T. amblyodonta are larger than in any other North American species of Tragia (K. I. Miller and G. L. Webster 1967).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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