A similar result was also seen in our studies of the flower development and evolution of homostylous selfing flowers from distylous outcrossing ones within Amsinckia spectabilis (Li & Johnston, unpubl.
In all three Amsinckia lineages studied, the timing of pollen-mother-cell meiosis shows no heterochrony when measured on a relative rather than absolute scale (Li & Johnston, 1999).
Mating patterns in self-compatible distylous populations of Amsinckia (Boraginaceae).
For the Bromus experiment, the response variables included Amsinckia tesselata, Descurania pinnata, Malacothrix coulteri, Gullenia lasiophyllum, Phacelia tanacetifolia and other natives.
Standardized canonical coefficients of density indicated that Amsinckia tesselata ([F.
The six species whose seeds were more abundant under shrubs, in both the soil and in the seed rain, either were shrub species under which Bush traps were placed (Larrea tridentata, Coleogyne ramosissima), or were herbaceous species that were closely associated with shrubs in Granite Cove (Schismus barbatus, Bromus madritensis rubens, Amsinckia
tesselata, Cryptantha pterocarya).
Amsinckia proved to yield particularly abundant exudate.
A crystaline inclusion in sieve element nuclei of Amsinckia II.
Distyly in Amsinckia conforms to the classic one-locus genetic model (Ganders 1979) in which the short style-long stamen floral morph (thrum) is dominant to the long style-short stamen morph (pin).
The distylous species typically occur in natural habitats such as chaparral borders, serpentine soils, and Pleistocene sand dunes, whereas many homostylous species of Amsinckia are most abundant as colonizing plants of roadsides, grazed pastures, and agricultural fields.
Amsinckia ("fiddleneck," Boraginaceae) is a genus of yellow- to orange-flowered annuals centered in western North America (Ray and Chisaki 1957a).
Amsinckia douglasiana flowers are approximately 15-22 mm long and 10-16 mm wide, while those of A.