|University of California, Berkeley|
|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, biennial from taproot. Stem: generally erect or ascending, branched distally or throughout. Leaf: simple, alternate, pinnately dissected; lobes generally bristle-tipped. Inflorescence: heads radiate, in cyme-like clusters; involucre bell-shaped or hemispheric; phyllaries graduated in 3--6 series, proximally straw-colored to +- purple, distally green; receptacle flat or convex, pitted, epaleate. Ray Flower: 8--many; corolla blue or purple. Disk Flower: 14--many; corolla yellow, lobes generally 0.3--0.7 mm, generally +- glabrous [0.7--1 mm, hairy]; anther tip lanceolate; style tips lanceolate to linear, distally bristly. Fruit: narrowly to broadly obovoid, +- flattened, 4--9-ribbed on each face, sparsely to densely hairy; pappus of many unequal, minutely barbed bristles.
Species In Genus: 2 species: temperate western North America. Etymology: (Greek: sword-like anthers) Note: Other taxa in TJM (1993) moved to Arida, Dieteria, Xanthisma in TJM2 (2012); taxa included in Arida in TJM2 (2012) moved to Leucosyris.
eFlora Treatment Author: David R. Morgan
Jepson Online Interchange
Previous taxon: Luina hypoleuca
Next taxon: Machaeranthera tanacetifolia
Citation for this treatment: David R. Morgan 2016. Machaeranthera, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=516, accessed on May 04, 2016.
Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on May 04, 2016.