Thelesperma | |
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Thelesperma filifolium | |
Scientific 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] | |
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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.
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]
The genus is found from Alberta, (Canada) to north and west Mexico and from Argentina to Uruguay. [3]
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]
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]
As of July 2023, Plants of the World Online accepts 12 species for this genus: [3]
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]
Cosmos is a genus, with the same common name of cosmos, consisting of flowering plants in the sunflower family.
Zinnia is a genus of plants of the tribe Heliantheae within the family Asteraceae. They are native to scrub and dry grassland in an area stretching from the Southwestern United States to South America, with a centre of diversity in Mexico. Members of the genus are notable for their solitary long-stemmed 12 petal flowers that come in a variety of bright colors. The genus name honors the German scientist Johann Gottfried Zinn (1727–1759).
Bidens is a genus of flowering plants in the aster family, Asteraceae. The genus include roughly 230 species which are distributed worldwide. Despite their global distribution, the systematics and taxonomy of the genus has been described as complicated and unorganized. The common names beggarticks, black jack, burr marigolds, cobbler's pegs, Spanish needles, stickseeds, tickseeds and tickseed sunflowers refer to the fruits of the plants, most of which are bristly and barbed. The generic name refers to the same character; Bidens comes from the Latin bis ("two") and dens ("tooth").
Coreopsis is a genus of flowering plants in the family Asteraceae. Common names include calliopsis and tickseed, a name shared with various other plants.
Palafoxia, or palafox, is a genus of North American flowering plants in the Bahia tribe within the Asteraceae.
Grindelia (gumweed) is a genus of plants native to the Americas belonging to the family Asteraceae. The genus was named for Latvian botanist David Hieronymus Grindel, 1776–1836.
Thelesperma filifolium, commonly known as stiff greenthread, or plains greenthread, is a species of flowering plant in the aster family, Asteraceae. It is often found growing in shallow soils. It prefers disturbed sites in dry, sandy or gravelly soil with a neutral to basic pH. Stiff greenthread adapts to various soil conditions, including loam, clay, caliche, and roadsides. It generally flowers from March to August, sometimes into October.
Heterotheca is a genus of North American plants in the family Asteraceae.
Thymophylla is a genus of perennial flowering plants in the tribe Tageteae within the family Asteraceae. Pricklyleaf is a common name for plants in this genus.
Berlandiera is a genus of flowering plants in the family Asteraceae.
Chaetopappa is a genus of plants in the family Asteraceae which are known generally as leastdaisies.
Tetraneuris, commonly known as four-nerve daisy or bitterweed, is a genus of North American plants in the sneezeweed tribe within the daisy family.
Flourensia is a genus of flowering plants in the family Asteraceae. It contains subshrubs and shrubs, which are commonly known as tarworts. They are found in the southwestern United States, Mexico, Central America, and South America. The genus name honours French physiologist Jean Pierre Flourens (1794–1867).
Haploesthes is a North American genus of flowering plants in the family Asteraceae. It grows in Mexico and in the southwestern United States. They are perennial herbs or subshrubs with yellow flower heads.
Pyrrhopappus is a genus of North American plants in the tribe Cichorieae within the family Asteraceae. Desert-chicory is a common name.
Chrysactinia is a genus of flowering plants in the family Asteraceae, native to Mexico and to the southwestern United States.
Thelesperma megapotamicum is a perennial, herbaceous, flowering plant in the Asteraceae family native to sections of the Americas. It is known by the common names Hopi tea greenthread, rayless greenthread, Navajo tea, cota, and greenthread.
Brickellia laciniata, the splitleaf brickellbush, is a North American species of flowering plants in the family Asteraceae. It is native to northeastern and north-central Mexico and the southwestern United States.
Thelesperma simplicifolium, commonly known as the slender greenthread, is a perennial, herbaceous, flowering plant in the Asteraceae family. It is found from Texas and Mexico in openings in oak or juniper woodlands or on desert scrub.
Thelesperma longipes, commonly called the longstalk greenthread, is a perennial herb or subshrub in the Asteraceae family. It is found from Arizona to northeast Mexico.