Trillium sessile

• Overview
• Interesting Facts
• Common Names
• Description
• Biology
• Taxonomy
• Similar Species
• More Info
• Further Reading
• Notes

Overview

Interesting Facts

Common Names

Description

Genus Trillium

Herbs, perennial , scapose , rhizomatous ; rhizomes subterranean , horizontal or semierect, monopodial, unbranched or weakly branched, elongated to thick and fleshy , compressed-shortened, distal end tapered to point or praemorse , apex bearing large terminal bud, numerous cataphylls, and contractile, adventitious, ringed roots . Scapes arising from terminal bud or axil of adjacent cataphylls, aerial (subterranean in T. petiolatum), erect , straight (decumbent , S-shaped in T. decumbens and T. reliquum). Bracts on mature plants in whorl of 3, uniformly green or mottled , foliaceous , petiolate or sessile, venation palmate-reticulate, with 3-5 major veins, ovate or obovate to elliptical . Inflorescences terminal, 1-flowered. Flowers: some totally to partially syncarpous , pedicellate or sessile; sepals persistent , 3, distinct , green, maroon, or with maroon markings, foliaceous, oblong , ovate, or lanceolate, alternating with bracts; petals shriveling after anthesis , typically 3, erect, spreading , or recurved, distinct, red, purple, pink, white, yellow, green, or combination of these, ovate or obovate to linear , sometimes clawed; stamens 6, alternating in 2 whorls of 3, erect, incurved , or divergent; filaments mostly short, basally expanded; anthers 2-locular, ± equaling or longer than filaments, dehiscence extrorse , latrorse , or introrse ; connectives flat between (or in some species extending beyond) anther sacs ; ovary superior, proximal portion 3-locular, 3- or 6-lobed, some axile , some parietal or a combination of both, distal portion forming stigmas; stigmas often persistent, 3, spreading, twisted, or erect, sometimes connate , sessile or with very short style, linear to subulate . Fruits capsular or baccate , fleshy with obscure sutures, not or rarely dehiscent along sutures, each shed as unit through abscission of thin-walled cells at base . Seeds many, elliptic , 2-4 mm, bearing white or yellowish, large, oily, myrmecochorous elaiosome (aril). x = 5. 2n = 10 in all American species recorded.

Species 43: North America, Asia.

Trillium is traditionally divided into two subgenera , which overlap in some characters. Botanists consider subg. Trillium to be the more primitive group, because the genera considered closest to Trillium all have pedicellate flowers, as does subg. Trillium, except for one variety of T. pusillum that bears sessile to only barely pedicillate flowers.

There is not yet agreement among taxonomists about the relationships among the species within the genus. Certain ones, such as Trillium recurvatum and T. lancifolium, clearly are closely related, but the interrelationships of many others are not obvious. In the absence of definitive studies, the species are listed here alphabetically within subgenera. Several species of Trillium contain sapogenins that have been used medicinally as astringents, coagulants , expectorants , and uterine stimulants, hence the common names birthwort and Indian balm, and T. erectum, T. grandiflorum, and possibly other species have been utilized commercially as beth root (W. B . Zomlefer 1996). Fruits, seeds, and rhizomes of trilliums are generally considered to be poisonous. Deer, however, feed voraciously on T. grandiflorum plants, especially in early spring . Gardeners and wildflower enthusiasts, over most of the temperate zones of the world, consider trilliums to be among the most beautiful of wildflowers. Species of Trillium exhibit few and obscure structural differences, making key construction difficult (J. D. Freeman 1975).[1]

Physical Description

Habitat

Rich woodlands, limestone districts, calcareous soils, floodplains , riverbanks, clayey alluvium , less fertile soils, high, dry limestone woods , persists under light pasturing, in fencerows and brushy areas after lumbering; 100--300 m [2].

Biology

Reproduction

Duration: Perennial

Growth

Culture: Space 6-9" apart.

Soil: Good, moist soil. • Minimum pH: 5.6 • Maximum pH: 7.5

Sunlight: Sun Exposure: Sun to Partial Shade.

Temperature: Cold Hardiness: 4a, 4b, 5a, 5b, 6a, 6b, 7a, 7b. (map)

Taxonomy

Notes

Publishing author : L. Publication : Sp. Pl. 1: 340 1753 [1 May 1753]

Similar Species

Members of the genus Trillium

ZipcodeZoo has pages for 58 species, subspecies, varieties, forms, and cultivars in this genus:

T. albidum (Giant Trillium) · T. angustipetalum (Narrowpetal Wakerobin) · T. catesbaei (Bashful Wakerobin) · T. cernuum (Nodding Trillium) · T. chloropetalum (Giant Wakerobin) · T. chloropetalum (Torr.) Howell var. chloropetalum (Torr.) T.J.Howell (Giant Wakerobin) · T. chloropetalum giganteum (Giant Wakerobin) · T. chloropetalum var. chloropetalum (Giant Wakerobin) · T. chloropetalum var. giganteum (Giant Wakerobin) · T. cuneatum (Little Sweet Betsy) · T. decipiens (Chattahoochee River Wakerobin) · T. decumbens (Trailing Trillium) · T. discolor (Mottled Wakerobin) · T. erectum (Red Erect Trillium) · T. erectum f. albiflorum (White Erect Trillium) · T. erectum var. japonicum (Stinking Benjamin) · T. flexipes (Bent Trillium) · T. foetidissimum (Mississippi River Wakerobin) · T. gracile (Sabine River Wakerobin) · T. grandiflorum (Great White Trillium) · T. grandiflorum f. polymerum 'Flore Pleno' (Double-Flowered American Wake-Robin) · T. grandiflorum Gothenburg pink strain (Great White Trillium) · T. grandiflorum 'Flore Pleno' (Trillium) · T. kamtschaticum (Trillium) · T. kurabayashi (Wake Robin) · T. kurabayashii (Giant Purple Wakerobin) · T. lancifolium (Lanceleaf Wakerobin) · T. ludovicianum (Louisiana Wakerobin) · T. luteum (Lemon Trillium) · T. maculatum (Spotted Wakerobin) · T. nivale (Dwarf White Wakerobin) · T. ovatum (Pacific Trillium) · T. ovatum oettingeri (Oettinger's Trillium) · T. ovatum 'Roy Elliott' (Western Trillium) · T. parviflorum (Smallflower Wakerobin) · T. persistens (Persistent Trillium) · T. petiolatum (Idaho Trillium) · T. pusillum (Dwarf Wakerobin) · T. pusillum var. ozarkanum (Ozark Wake-Robin) · T. pusillum var. pusillum (Dwarf Wakerobin) · T. pusillum var. virginianum (Virginia Wakerobin) · T. rectum (Stinking Benjamin) · T. recurvatum (Bloody Butcher) · T. reliquum (Confederate Wakerobin) · T. reliquum f. luteum (Relic Trillium) · T. rivale (Brook Wakerobin) · T. rugelii (Ill-Scented Wakerobin) · T. sessile (Common Toad Shade) · T. simile (Jeweled Wake Robin) · T. stamineum (Blue Ridge Wakerobin) · T. sulcatum (Barksdales Trillium) · T. texanum (Texas Trillium) · T. tschonoskii (Tschonoskis Wake Robin) · T. underwoodii (Lonbract Wakerobin) · T. undulatum (Painted Trillium) · T. vaseyi (Sweet Wakerobin) · T. viride (Wood Wakerobin) · T. viridescens (Tapertip Wakerobin)

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Further Reading

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• Hooker, W. J. & G. A. W. Arnott. The botany of Captain Beechey's voyage;comprising an acount of the plants collected by Messrs. Lay and Collie, and other officers of the expedition, during the voyage to the Pacific and Behring's Strait, performed in His Majesty's ship Blossom, under the command of Captain F. W. Beechey. .. in the years 1825, 26, 27, and 28.By Sir William Jackson Hooker. .. and G. A. Walker Arnott. .. 1841 London, H. G. Bohn, 1841. url p. 402.
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• Western flower guide, wild flowers of the Rockies and west to the Pacific, Garden City, Doubleday, Page & company, 1917. url p. 11, p. 284.
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• Kato, H. et al. 1995. Evolutionary biology of Trillium and related genera (Trilliaceae). 1. Restriction site mapping and variation of chloroplast DNA and its systematic implications. Pl. Spec. Biol. 10: 7-30.
• Kazempour Osaloo, S., F. H. Utech, M. Ohara, and S. Kawano. 1999. Molecular systematics of Trilliaceae I. Phylogenetic analyses of Trillium using matK gene sequences. J. Pl. Res. 112: 35-49.
• Samejima, K. and J. Samejima. 1987. Trillium Genus Illustrated. Sapporo.

Notes

Contributors

• Brands, S.J. (comp.) 1989-present. The Taxonomicon. Universal Taxonomic Services, Zwaag, The Netherlands. Accessed January 9, 2012.

Data Sources

Accessed through GBIF Data Portal November 22, 2007:

• Missouri Botanical Garden, Missouri Botanical Garden
• USDA PLANTS, USDA PLANTS Database
• University of Alabama Biodiversity and Systematics, Herbarium

Identifiers

• Biodiversity Heritage Library NamebankID: 2662700
• Catalogue of Life Accepted Name Code: Kew-290621
• Global Biodiversity Information Facility Taxonkey: 13754804
• Globally Unique Identifier: urn:lsid:ipni.org:names:542602-1
• Integrated Taxonomic Information System (ITIS) Taxonomic Serial Number (TSN): 43088
• International Plant Names Index (IPNI) ID: 542602-1
• U.S.D.A. Plant Symbol: TRSE2
• Zipcode Zoo Species Identifier: 66865

Footnotes

1. Frederick W. Case Jr. "Trillium". in Flora of North America Vol. 26 Page 51, 54, 56, 90, 91, 97, 101, 110, 113, 150. Oxford University Press. Online at EFloras.org. [back]
2. "Trillium sessile". in Flora of North America Vol. 26 Page 96, 110, 115. Oxford University Press. Online at EFloras.org. [back]

©2004-2012 David Stang. All rights reserved.