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Trillium underwoodii Small
Long-bracted Trillium

Life   Plantae   Monocotyledoneae   Liliaceae   Trillium

Trillium underwoodii
© John Pickering, 2004-2017 · 9
Trillium underwoodii

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Trillium underwoodii
© John Pickering, 2004-2017 · 1
Trillium underwoodii
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Trillium underwoodii Small
longbract wakerobin

General Information
Symbol: TRUN2
Group: Monocot
Family: Liliaceae
Duration: Perennial
Growth Habit : Forb/herb
Native Status : L48   N
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Native Status:
lower 48 status L48    Alaska status AK    Hawaii status HI    Puerto Rico status PR    Virgin Islands status VI    Navassa Island NAV    Canada status CAN    Greenland status GL    Saint Pierre and Michelon status SPM    North America NA   





Click on a scientific name below to expand it in the PLANTS Classification Report.
Rank Scientific Name and Common Name
Kingdom Plantae – Plants
Subkingdom Tracheobionta – Vascular plants
Superdivision Spermatophyta – Seed plants
Division Magnoliophyta – Flowering plants
Class Liliopsida – Monocotyledons
Subclass Liliidae
Order Liliales
Family Liliaceae – Lily family
Genus Trillium L. – trillium
Species Trillium underwoodii Small – longbract wakerobin

Subordinate Taxa

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Wetland Status

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Flora of North America (TRUN2)
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USF Atlas of Florida Vascular Plants (TRUN2)



Source Large Mammals Small Mammals Water Birds Terrestrial Birds


Source Large Mammals Small Mammals Water Birds Terrestrial Birds

Description of Values

Value Class Food Cover

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Following modified from Flora of North America
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FNA Vol. 26 Page 95, 116 Login | eFloras Home | Help
FNA | Family List | FNA Vol. 26 | Liliaceae | Trillium

36. Trillium underwoodii Small, Bull. Torrey Bot. Club. 24: 172. 1897.

Underwood's trillium

Rhizomes horizontal, brownish, short, thick, praemorse, not brittle. Scapes 1—2, round in cross section, 0.8-2 dm, slender to stout, glabrous. Bracts usually drooping, often touching ground in early anthesis, sessile; blade pale silvery green, strongly mottled in 3 or more shades of dark green and bronze, sometimes maroon, mottling becoming obscure with age, ovate-lanceolate to obovate, 6.5—12 × 5—7.8 cm, margins of distal 1/3 straight from rounded base to apex, apex acuminate. Flower erect, odor fetid, especially when first open; sepals displayed above bracts, spreading, green or purple on adaxial surface, lanceolate, 4.5—5 × 8—12 mm, margins entire, flat, apex rounded-acute; petals long-lasting, erect-spreading, ± connivent, ± concealing stamens and ovary or at least partially obscuring stamens, tips ± incurved, dark maroon-red, or purplish red, brownish maroon, or yellowish green, not spirally twisted, oblanceolate to elliptic, 3—5.5+ × 1—1.5 cm, usually 3—4 times longer than wide, thick-textured, margins entire, apex acute; stamens ± erect to weakly incurved, 14—17 mm; filaments purple, 1—2 mm; anthers 8—15 mm, thick, dehiscence latrorse; connectives brown-purple, straight, extended 1—2 mm beyond anther sacs, apex somewhat acute; ovary purple, ellipsoid, 6-angled, 6.3—11 mm; stigmas erect, abruptly recurved upon ovary, distinct, purplish, linear, 1.5—5 mm, slightly thickened basally, fleshy. Fruits baccate, purple-black to dull greenish maroon, odorless, ovoid to obovoid, 6-angled (-ridged), 0.7—1 cm diam., pulpy, not juicy.

Flowering mid winter--spring (late Feb--mid Apr). Rich to dryish deciduous forests of mature or second-growth timber, dominated by oaks or with beech-oaks, occasionally with scattered pines present, flat ground along streams where soil can be fairly moist, rich clay or sand; 100--200 m; Ala., Fla., Ga.

Trillium underwoodii can cause considerable confusion for the beginning student of the genus. In some ways it closely resembles a small-statured T. cuneatum. As T. underwoodii continues to expand after flowering, it may become somewhat taller and less "ground hugging," and it then appears similar to a smaller plant of T. decipiens, which grows in parts of the same range, especially when its bracts do not touch the ground at anthesis. It also has vague similarities to T. reliquum, with which it grows sympatrically in parts of its range. Care should be taken to observe the details of floral structure accurately.

Distribution of Trillium underwoodii is much more restricted than that given by J. K. Small (1933), who indicated a range extending from Alabama to North Carolina and Arkansas.

Updated: 2019-03-23 09:02:45 gmt
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