Tradescantia spathacea
Tradescantia wrightii
boat-lily, moses-in-the-cradle, oyster-plant
Wright's spiderwort
unbranched, short.
unbranched, 5–18 cm.
spirally arranged;
blade usually abaxially purple, adaxially green, strap-shaped, to 35 × 5 cm (distal leaf blades wider or narrower than sheaths when sheaths opened, flattened), leathery, succulent, glabrous.
blade linear-lanceolate, 4–10 × 0.2–0.5 cm (distal leaf blades equal to or narrower than sheaths when sheaths opened, flattened), firmly membranaceous to subsucculent, glaucous or glaucescent, glabrous.
axillary, sessile, or pedunculate in axils well below shoot apex, cymes enclosed in pairs of boat-shaped spathes.
terminal, solitary;
bracts foliaceous.
distinctly pedicillate;
pedicels glabrous;
sepals distinct, white, 3–6 mm, glabrous;
petals distinct, white, ovate, not clawed;
stamens free;
filaments bearded.
distinctly pedicillate;
pedicels 1.2–1.7 cm, with few to many minute glandular hairs (or glabrous);
sepals glaucous or glaucescent, 0.5–0.6 cm, glabrous or with a few minute glandular hairs at base;
petals distinct, rose to magenta or purple, broadly ovate, not clawed, 1 cm;
stamens free;
filaments bearded.
3- or (by abortion) 2-locular, 3–4 mm.
3–4 mm.
1 per locule, 3–4 mm.
2–3 mm.
= 6.
= 12 (Belize).
Tradescantia spathacea
Tradescantia wrightii
Tradescantia spathacea is native to southern Mexico, Central America, and the West Indies.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Tradescantia wrightii var. glandulopubescens was described for Mexican plants with glandular-pubescent pedicels and sepals (B. L. Turner 1983), and this variety was listed for Texas (B. L. Turner 1993; S. L. Hatch et al. 1990). All U.S. collections that I have examined, however, including the holotype of T. wrightii, have at least some glandular hairs on these parts. Marshall Johnson believes that this is a valid variety, and I may not have examined typical specimens, but the diagnosis is not differential from the typical variety.
Tradescantia wrightii and T. pinetorum belong to section Tradescantia ser. Tuberosae D. R. Hunt and differ from the species of ser. Virginianae D. R. Hunt (species 1–19) by being geophytes (instead of hemicryptophytes) and in having the hilum much shorter than the seed (instead of ± equal to the seed). Tradescantia wrightii differs from T. pinetorum by its lack of root tubers, its glabrous leaves and internodes, and the absence of lateral inflorescences. The glandular hairs on the pedicels and sepal bases, much shorter than those of T. pinetorum, are easily overlooked.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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