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|Jepson eFlora: Taxon page
Key to families | Table of families and genera
Index to accepted names and synonyms:
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|Family: Asteraceae (Compositae)||View Description||Dichotomous Key|
|Genus:||View Description||Dichotomous Key|
|Species:||View Description||Dichotomous Key|
Habit: Annual [perennial herb], generally taprooted. Stem: generally erect, simple or branched. Leaf: mostly cauline at flower, alternate, sessile (in California), generally 1-veined, linear or elliptic to (ob)ovate or spoon-shaped, entire, toothed, or 1--2-pinnately lobed, minutely coarse-hairy to long-soft-hairy, generally glandular. Inflorescence: heads obscurely radiate or disciform, in +- flat-topped or raceme- or panicle-like clusters; involucres +- obconic, 2--7+ mm diam; phyllaries 20--40+ in 2--4 series, appressed, generally reflexed in fruit, linear to lanceolate, +- (un)equal, margins +- membranous, abaxial face +- green, minutely hairy, generally glandular, midvein not orange to brown; receptacle +- flat, pitted or smooth, epaleate. Pistillate Flower: 60--100; corolla thread-like, +- yellow, generally distally truncate or 2--5-toothed, ray 0 [0.5--1+ mm]. Disk Flower: ; Fruit: oblong to elliptic or obovate, compressed, each edge 1-veined, faces glabrous or +- minutely strigose, often stalked- or sessile-glandular; pappus in California of 9--30+ white to tawny, minutely-barbed, distally long-tapered bristles, in 1 series, +- equal, persistent.
Species In Genus: +- 18 species: New World. Etymology: (R.-T.-H. Laennec, French physician, 1781--1826)
eFlora Treatment Author: Bruce G. Baldwin, adapted from Strother (2006)
Jepson Online Interchange
Previous taxon: Lactuca virosa
Next taxon: Laennecia coulteri
Citation for this treatment: Bruce G. Baldwin, adapted from Strother (2006) 2016. Laennecia, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=494, accessed on July 28, 2016.
Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on July 28, 2016.