Key to Bidens
View taxon page for Bidens
(For a list of species in Bidens, use the above link.)
Jepson Manual glossary definitions can be seen by moving your cursor over words underlined with dots.
1. Leaf simple Composed of a single part; undivided; unbranched.
2' Leaf
sessile Without a petiole, peduncle, pedicel, or other kind of stalk.
3. Fruit with ± thickened
margin, prominently
ribbed;
palea 1. In Asteraceae, a scale-like bract that subtends an individual flower on the receptacle (equal to 'chaff scale' in TJM), absent in some genera, restricted to a ring separating ray and disk flowers in most tarweed species. 2. In Poaceae, the distal, generally smaller of two sheathing bracts subtending a flower, generally two-veined and -keeled and ensheathed by the lemma; with the lemma and flower, comprising the floret.
tips yellow; ray 0 or < 15 mm
..... B. cernua 3' Fruit without thick margin or prominent
ribs; palea tips ± red; ray 15–30 mm
..... B. laevis 1' Leaf
pinnate Feather-like; pertaining to veins, lobes, leaflets, or other structures arranged in two dimensions (i.e., in one plane) along either side of an axis; a leaf is odd-pinnate if there is a terminal leaflet, even-pinnate if there is not, and either odd- or even-pinnate may be 1-pinnate (blade divided into primary leaflets), 2-pinnate (primary leaflets divided into secondary leaflets), 3-pinnate (secondary leaflets divided into tertiary leaflets), etc.
4. Fruit narrowly
cylindric Elongate, with parallel sides and, at any point, round in transverse section.
or slightly
compressed Flattened side-to-side or front-to-back.
, 4-angled
..... B. pilosa 4' Fruit wedge-shaped, flat
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Citation for the whole project: Jepson Flora Project (eds.) . Jepson eFlora, https://ucjeps.berkeley.edu/eflora/ [accessed on ]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on .
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