Contains 14 accepted taxa overall.
Characteristics
Classification
Citation
BIDENS Linnaeus, Sp. Pl. 831. 1753, nom. cons.
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TYPE: Bidens tripartita Linnaeus, gen. fem. cons. Lectotypified by Britton & A. Brown, Ill. Fl. N. U.S., ed. 2. 3: 494. 1913.
Species
| Scientific Name | Common Name | Herbarium Specimens | Status | Photos |
|---|---|---|---|---|
| Bidens alba var. radiata | Spanish Needles, Beggarticks, Romerillo | |||
| Bidens aristosa | Midwestern Tickseed-sunflower | |||
| Bidens bipinnata | Spanish Needles | |||
| Bidens cernua | Nodding Bur-marigold | |||
| Bidens comosa | Strawstem Beggar-ticks | |||
| Bidens connata | Purplestem Beggar-ticks | |||
| Bidens discoidea | Few-bracted Beggar-ticks | |||
| Bidens frondosa | Devil's Beggar-ticks | |||
| Bidens laevis | Showy Bur-marigold | |||
| Bidens mitis | Coastal Plain Tickseed-sunflower | |||
| Bidens pilosa | ||||
| Bidens polylepis | Midwestern Tickseed-Sunflower | |||
| Bidens trichosperma | Northern Tickseed-sunflower | |||
| Bidens vulgata | Tall Beggar-ticks |
Identification Key
1. Leaves simple, toothed, sessile
1. Leaves lobed to divided or compound, petiolate (at least some, sometimes some leaves simple, toothed but generally petiolate)
2
2. Leaves 2-3-pinnatisect, lobes ovate, often entire or with few, coarse teeth
2. Leaves 1-pinnatisect, pinnately compound, or if 2-pinnatisect then ultimate lobes narrowly oblanceolate to linear
3. Ray floret laminae yellow, 10-30 mm long
4
3. Ray floret laminae white, absent, or if yellow to 3.5 mm long
5
4. Leaves 1-pinnatisect or pinnately compound, lobes or leaflets usually 3(-7); cypselae broadly cuneate, 1.5-2.5 times as long as wide, margins not barbed, not ciliate
4. Leaves 1- to 2-pinnatisect or 1-pinnately compound, lobes or leaflets (3)5-9; cypselae narrowly cuneate, 2.5-4 times as long as wide, margins barbed or ciliate
5. Calyculus (subtending phyllaries) (3)5-20(60) mm long, at least some subequal to longer than disc florets and cypselae; ray florets absent or ray laminae yellow; cypselae laterally flattened
6
5. Calyculus (subtending phyllaries) 3-5 mm long, subequal to shorter than disc florets and cypselae; ray florets absent or ray laminae white; cypselae quadrangular
7
6. Calyculus bracts (3)4(5), usually eciliate; disc florets (10)15-25
6. Calyculus bracts 5-21, usually ciliate; disc florets 20-60(120)
7. Ray florets 5-8, sterile, laminae 5-16 mm long; pappus of 2 awns
7. Ray florets 0(3), if present then fertile and laminae 3-5 mm long; pappus of (2)3(-5) awns
Genus Synonyms
| Synonym | Full Citation | Basionym | Type |
|---|---|---|---|
| No synonyms found. | |||