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blunt-tooth noseburn, dog-tooth noseburn

Florida keys noseburn

Habit Subshrubs, 1.2–5 dm. Herbs or subshrubs, 1.2–3.5 dm.
Stems

erect to trailing, gray-green, apex often flexuous.

erect, green, apex flexuous.

Leaves

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.

petiole 5–13 mm;

blade suborbiculate to ovate, 1.2–3 × 1–2.3 cm, base subcordate, margins dentate to serrate, apex acute.

Inflorescences

terminal or axillary, glands absent, staminate flowers 5–16 per raceme;

staminate bracts 0.9–2 mm.

terminal (often appearing leaf opposed), glands absent, staminate flowers 12–20 per raceme;

staminate bracts 0.8–1.2 mm.

Pedicels

staminate 0.7–1.2 mm, persistent base 0.2–0.8 mm;

pistillate 1.5–4 mm in fruit.

staminate 1.5–1.9 mm, persistent base 0.5–0.7 mm;

pistillate 3.2–3.7 mm in fruit.

Staminate flowers

sepals 3–4, green, 0.9–1.2 mm;

stamens 3–4, filaments 0.2–0.7 mm.

sepals 3–4, green, 1–1.5 mm;

stamens 3–4, filaments 0.4–0.6 mm.

Pistillate flowers

sepals lanceolate, 1–2.5 mm;

styles connate to 1/3 length, short-exserted;

stigmas undulate to subpapillate.

sepals lanceolate, 1.5–3 mm;

styles connate 1/4–1/3 length;

stigmas undulate.

Capsules

7–8 mm wide.

6–7 mm wide.

Seeds

brown with tan mottling, 2.5–3.5 mm.

dark brown with light brown streaks, 2.4–3 mm.

2n

= 110.

Tragia amblyodonta

Tragia saxicola

Phenology Flowering spring–fall; fruiting summer–late fall. Flowering late winter–fall; fruiting spring–early winter.
Habitat Dry, rocky, exposed slopes in xerophytic scrub. Dry pinelands and hammocks on limestone substrates.
Elevation 10–1400 m. (0–4600 ft.) 0–10 m. (0–0 ft.)
Distribution
from FNA
AZ; NM; TX; Mexico (Chihuahua, Coahuila, Durango, Nuevo León, Tamaulipas)
[BONAP county map]
from FNA
FL
[BONAP county map]
Discussion

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.)

Tragia saxicola occurs in south Florida and the Florida Keys. Although similar to T. smallii in its suborbiculate leaf blades, it differs in having longer petioles and smaller seeds.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 12, p. 186. FNA vol. 12, p. 189.
Parent taxa Euphorbiaceae > Tragia Euphorbiaceae > Tragia
Sibling taxa
T. betonicifolia, T. brevispica, T. cordata, T. glanduligera, T. jonesii, T. laciniata, T. leptophylla, T. nepetifolia, T. nigricans, T. ramosa, T. saxicola, T. smallii, T. urens, T. urticifolia
T. amblyodonta, T. betonicifolia, T. brevispica, T. cordata, T. glanduligera, T. jonesii, T. laciniata, T. leptophylla, T. nepetifolia, T. nigricans, T. ramosa, T. smallii, T. urens, T. urticifolia
Synonyms T. nepetifolia var. amblyodonta
Name authority (Müller Arg.) Pax & K. Hoffmann: in H. G. A. Engler, Pflanzenr. 68[IV,147]: 51. (1919) Small: Fl. S.E. U.S. 702, 1333. (1903)
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