Comprehensive Description
provided by North American Flora
Tanacetum douglasii DC. Prodr. 6: 128. 1837
Tanacetum huronense A. Gray, Syn. Fl. N. Am. 1^: 366, in part. 1884.
A stout perennial, with a branched rootstock; stem 3-5 dm. high, more or less villous; leaves 1-2 dm. long, obovate or oblong-oblanceolate in outline, twice or thrice interruptedly pinnatifid, villous; primary divisions oblong in outline, obtuse, 2-5 cm. long, the secondary ones obovate, toothed or cleft, the teeth or lobes oblong, obtuse; heads few, 3-10, corymbose; involucre depressed-hemispheric, 5 mm. high, 10-15 mm. broad; bracts 25-30, in 2 series, villous, the outer lanceolate, acute, the inner elliptic or ovate, mostly obtuse, with brown tips; ray-flowers few; corollas about 5 mm. long; ligules flabelliform, deeply 3-lobed, as long as the tube; style-branches short, oblong; disk-flowers very numerous; corollas 4 mm. long; achenes 3 mm. long, obtusely angled; pappus a short crown.
Type locality: Western North America.
Distribution: British Columbia to Oregon.
- bibliographic citation
- Per Axel Rydberg. 1916. (CARDUALES); CARDUACEAE; TAGETEAE, ANTHEMIDEAE. North American flora. vol 34(3). New York Botanical Garden, New York, NY
Comprehensive Description
provided by North American Flora
Tanacetum huronense Nutt. Gen. 2 : 141. 1818
A stout perennial, with a branched rootstock; stem 3-6 dm. high, simple or branched above, more or less villous; leaves elliptic or oval in outline, 1-3 dm. long, twice or thrice interruptedly pinnatifid, more or less villous; primary divisions oblong in outline, acute, 2-6 cm. long, with smaller ones interposed on the narrowly winged rachis; secondary divisions elliptic, acute, toothed or often cleft into lanceolate lobes; heads few, 1-8, corymbose; involucre hemispheric or depressed, 5 mm. high, 10-15 mm. broad; bracts 20-30, in 2 series, lanceolate, acute, with brownish or purphsh scarious tips; ray-flowers in a single series, pistillate; coroUas about 4 mm. long; ligules oval, 2-2.5 mm. long, with enrolled margins, slightly 3-lobed; disk-flowers very numerous; corollas 3 mm. long; achenes 3 mm. long, somewhat angled; pappus a 3-5-lobed crose crown.
Type locality: Shores of Lake Huron, near Michilimackinack.
DiSTRiBUTTON : New Brunswick and Maine to Michigan and Hudson Bay.
- bibliographic citation
- Per Axel Rydberg. 1916. (CARDUALES); CARDUACEAE; TAGETEAE, ANTHEMIDEAE. North American flora. vol 34(3). New York Botanical Garden, New York, NY
Comprehensive Description
provided by North American Flora
Tanacetum camphoratum Less. Linnaea 6 : 521. 1831
Omalanihus camphorattts Less. Syn. Comp. 260. 1832.
Omalotes camphoraia DC. Prodr. 6: 84. 1837.
Tanacetum huronense Nutt. Trans. Am. Phil. See. II. 7: 401. in part. 1841.
Tanacetum elegans Decaisne, Fl. Serres 12: 19. 1857.
A stout perennial, with a branched rootstock; stem 3-5 dm. high, arachnoid-viUous; leaves 1-2 dm. long, twice pinnatifid, arachnoidvillous, oval in outline, obtuse; primary divisoins oblong, obtuse, 2-5 cm. long; secondary diasions crowded, oblong, obtuse, cleft into short oblong lobes; heads few, 3-12, in a congested corymb, short-pedvmcled ; involucre depressedhemispheric, 5-6 mm. high, 10-16 mm. broad; bracts 25-30, densely arachnoid-villous, the outer lanceolate, the inner oblong, obtusish; ray-flowers few, in a single series; corollas tubular, flattened, oblique, 3-lobed, 4 mm. long, not longer than the disk-flowers; style shorter than the corolla; branches oblong, obtuse; disk-corollas tubular, 5-toothed, 4 mm. long, glabrous; style included; branches short, truncate; achenes 4 mm. long, bluntly 3-5-angled, densely glandular-granuhf erous ; pappus a bluntly toothed erose crown.
Type locality: California.
Distribution: Beaches, California and Oregon.
- bibliographic citation
- Per Axel Rydberg. 1916. (CARDUALES); CARDUACEAE; TAGETEAE, ANTHEMIDEAE. North American flora. vol 34(3). New York Botanical Garden, New York, NY
Tanacetum huronense
provided by wikipedia EN
Tanacetum huronense, also known as Lake Huron tansy, is a type of wildflower most commonly found on sand dunes around the Great Lakes. Lake Huron tansy currently requires conservation measures in some regions.[1]
Region
Lake Huron tansy is most commonly found around the northern coasts of Lake Michigan and Lake Huron as well as the southeast coast of Lake Superior, but has also been found in Maine and from Alaska across Canada.[2] This plant lives in the sandy soil of the sand dunes and beaches of these regions.[1] The Lake Huron tansy requires sun as well as dry sandy soil to thrive.[2] However, this species can also handle waves when water levels are higher.[1]
Plant structure
Lake Huron tansy grows approximate 12” tall[3] from 1-3 stems.[1] If any part of the plant is crushed a very distinct odor is released, similar to the common garden tansy.[4]
Lake Huron tansy typically blooms during the months of late June through early August. The flower is a yellow “daisy type” flower, composed of many smaller flowers. The flower head is made up of disk flowers and ray flowers fill in around the outer rim of the head.[1] The flowers are typically 13-19mm in diameter.[5]
The leaves are visually lacy and hairy.[4] The structure of the leaves are bipinnately compound[5] between 23 and 26 cm long and 3 to 9 cm wide.[6]
Conservation
Tanacetum huronense is currently being monitored by various states and countries. It is currently a threatened species in Michigan and endangered in Wisconsin. In addition, Lake Huron tansy is a special concern species in some Canadian provinces.[2] According to the Wisconsin DNR, this species has a very high priority for conservation due to very few natural occurrences.[6]
In Michigan, Lake Huron tansy is threatened by invasive species such as spotted knapweed and baby’s breath. In addition, this species is threatened by habitat destruction and disturbances from humans.[1]
References
- license
- cc-by-sa-3.0
- copyright
- Wikipedia authors and editors
Tanacetum huronense: Brief Summary
provided by wikipedia EN
Tanacetum huronense, also known as Lake Huron tansy, is a type of wildflower most commonly found on sand dunes around the Great Lakes. Lake Huron tansy currently requires conservation measures in some regions.
- license
- cc-by-sa-3.0
- copyright
- Wikipedia authors and editors
