Thelesperma
| Thelesperma | |
|---|---|
| File:Thelesperma filifolium.jpg | |
| Thelesperma filifolium | |
| Scientific classification Edit this classification | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Asterids |
| Order: | Asterales |
| Family: | Asteraceae |
| Subfamily: | Asteroideae |
| Tribe: | Coreopsideae |
| Genus: | Thelesperma Less. |
| Type species | |
| Thelesperma scabiosoides | |
| Synonyms[1] | |
| |
Thelesperma, commonly known as greenthreads, is a genus of annual or perennial herbs and subshrubs found in the Americas. Members of this genus are closely related to some species of Coreopsis and Bidens. The genus is considered to be within the family Asteraceae.
Description
[edit | edit source]Plants of this genus are annual or perennial herbs or subshrubs that typically range from 10 to 70 cm (3.9 to 27.6 in) in height. Most species of this genus have opposite leaves that contain pinnately lobed, usually glabrous leaf blades. Depending on the species, the leaves can be mostly basal to mostly cauline. The species bear radiate or discoid flower heads that are borne singly or are in loose, corymbiform arrays. Each flower head contains up to eight ray florets (some sp. do not have ray florets) with yellow, reddish brown or yellow and brown bicolored corollas, and 20 to over 100 yellow or brown disc florets.[2]
Distribution
[edit | edit source]The genus is found from Alberta, (Canada) to north and west Mexico and from Argentina to Uruguay.[3]
Taxonomy
[edit | edit source]Thelesperma was first named and described by Christian Friedrich Lessing in 1831 in the journal Linnaea.[4][5] The genus is closely related to parts of Coreopsis and to certain North American Bidens species (including Bidens coronata and Bidens comosa).[6][7]
Etymology
[edit | edit source]The name Thelesperma is derived from the ancient Greek words θηλή (transl. grc – transl. Thele, meaning "nipple") and σπέρμα (transl. grc – transl. sperma, meaning "seed") referring to the papillate cypselae of some of the species.[2]
In English, the genus is commonly known as greenthreads.[8]
Species
[edit | edit source]As of July 2023, Plants of the World Online accepts 12 species for this genus:[3]
- Thelesperma burridgeanum S.F.Blake - (Texas, Coahuila)
- Thelesperma filifolium (Hook.) A.Gray - (United States to northeast Mexico)
- Thelesperma flavodiscum (Shinners) B.L.Turner - (Texas, Louisiana, Arkansas)
- Thelesperma graminiformis (Sherff) Melchert - (Nuevo León, Tamaulipas)
- Thelesperma longipes A.Gray - (Arizona to Texas and northern Mexico)
- Thelesperma megapotamicum (Spreng.) Herter - (United States, Mexico, Uruguay, Argentina)
- Thelesperma muelleri (Sherff) Melchert - (Nuevo León, Tamaulipas)
- Thelesperma nuecense B.L.Turner - (Texas)
- Thelesperma scabridulum S.F.Blake - (Coahuila, Nuevo León, Tamaulipas)
- Thelesperma simplicifolium (A.Gray) A.Gray - (Texas, Mexico)
- Thelesperma subaequale S.F.Blake - (Coahuila, Nuevo León)
- Thelesperma subnudum A.Gray - (Alberta, central United States)
Uses
[edit | edit source]Members of the genus are used by a number of the southwestern Native American peoples as an herbal tea. T. megapotamicum contains luteolin.[9] It also appears that many of the species contain a very similar chromatographic profile, and thus may contain very similar profiles of flavenoids.[10]
References
[edit | edit source]- ^ Flann, C (ed) 2009+ Global Compositae Checklist
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lessing, Christian Friedrich. 1831. Linnaea 6(3): 511–513 in Latin
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- ^ Hansen, C. J., L. Allphin, and M. D. Windham. 2002. Biosystematic analysis of the Thelesperma subnudum complex (Asteraceae). Sida 20: 71–96.
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External links
[edit | edit source]- Error creating thumbnail: File missing Media related to Lua error in Module:Commons_link at line 62: attempt to index field 'wikibase' (a nil value). at Wikimedia Commons
- File:Wikispecies-logo.svg Data related to Thelesperma at Wikispecies
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