The green links below add additional plants to the comparison table. Blue links lead to other Web sites.
enable glossary links

Ernest's spiderwort

giant spiderwort

Habit Herbs, erect or ascending, rarely rooting at nodes. Herbs, erect or ascending, rarely rooting at nodes.
Roots

(1–)1.5–5 mm thick, fleshy.

Stems

not flexuous, 5–40 cm;

internodes usually glabrous.

16–100 cm;

proximal internodes glabrous, distal glabrous to densely eglandular-puberulent.

Leaves

spirally arranged, sessile;

blade dull green, linear-lanceolate to lanceolate-oblong, 9–27 × 1–4 cm (distal leaf blades wider than sheaths when sheaths opened, flattened), base cuneate to rounded, apex acuminate, not glaucous, glabrous or sparsely puberulent.

spirally arranged, sessile (with sheaths ± saccate);

blade linear-lanceolate, 10–40 × 0.5–2.5 cm (distal leaf blades equal to or narrower than sheaths when sheaths opened, flattened), glaucous, glabrous or adaxially densely and minutely eglandular-velvety.

Inflorescences

terminal;

bracts foliaceous.

terminal, axillary;

bracts reduced, bases saccate, minutely velvety.

Flowers

distinctly pedicillate;

pedicels 2–3.2 cm, minutely pilose;

sepals somewhat inflated, 9–16 mm, uniformly eglandular-pilose;

petals distinct, deep blue, purple, or rose-red, broadly ovate, not clawed, 1.2–1.5 cm;

stamens free;

filaments bearded.

distinctly pedicillate;

pedicels 0.9–2.8 cm, densely eglandular-puberulent;

sepals 5–13 mm, densely, minutely eglandular-puberulent;

petals distinct, magenta to blue or violet, broadly obovate, not clawed, 1.5–1.8 cm;

stamens free;

filaments bearded.

Capsules

5–7 mm.

6–7 mm.

Seeds

2–3 mm.

2–3 mm.

2n

= 12.

= 12.

Tradescantia ernestiana

Tradescantia gigantea

Phenology Flowering spring (Mar–May). Flowering spring (Mar–May).
Habitat Wooded hillsides, ledges and bluffs, occasionally along streams or in pastures Rocky limestone areas, pasturelands, weedy lots, roadsides, and along railroad tracks
Distribution
from FNA
AL; AR; GA; MO; OK; TX
[WildflowerSearch map]
[BONAP county map]
from FNA
LA; TX
[BONAP county map]
Discussion

Tradescantia ernestiana is sympatric with, and easily confused with, T. virginiana in northern Alabama and perhaps northern Georgia [reported from Georgia by C. Sinclair (1967, p. 87), but no specimens are cited and I have seen none]. At present, the two species can be separated only by the relative width of the blade and sheath of the distal leaves. They are obviously closely related and should be studied in the field in the southern Appalachians where their ranges overlap. The Texas record is taken from C. Sinclair (1967).

The hybrid Tradescantia ernestinana × T. ozarkana is known from Arkansas and Missouri.

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

Plants of Tradescantia gigantea growing around Ruston, Louisiana may have originated from cultivated plants. They hybridize with T. ohiensis there.

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

Source FNA vol. 22. FNA vol. 22.
Parent taxa Commelinaceae > Tradescantia Commelinaceae > Tradescantia
Sibling taxa
T. bracteata, T. brevifolia, T. buckleyi, T. crassifolia, T. crassula, T. edwardsiana, T. fluminensis, T. gigantea, T. hirsuticaulis, T. hirsutiflora, T. humilis, T. leiandra, T. longipes, T. occidentalis, T. ohiensis, T. ozarkana, T. pallida, T. paludosa, T. pedicellata, T. pinetorum, T. reverchonii, T. roseolens, T. spathacea, T. subacaulis, T. subaspera, T. tharpii, T. virginiana, T. wrightii, T. zebrina
T. bracteata, T. brevifolia, T. buckleyi, T. crassifolia, T. crassula, T. edwardsiana, T. ernestiana, T. fluminensis, T. hirsuticaulis, T. hirsutiflora, T. humilis, T. leiandra, T. longipes, T. occidentalis, T. ohiensis, T. ozarkana, T. pallida, T. paludosa, T. pedicellata, T. pinetorum, T. reverchonii, T. roseolens, T. spathacea, T. subacaulis, T. subaspera, T. tharpii, T. virginiana, T. wrightii, T. zebrina
Name authority E. S. Anderson & Woodson: Contr. Arnold Arbor. 9: 58, plate 8, map 4. (1935) Rose: Contributions from the U. S. National Herbarium 5: 205. (1899)
Web links