non-volatile vegetable) oil in the achenes
("seeds"), and this additional dimension of variability caused by human selection will be examined in the "Evolution of Seed Oil Production Under Domestication" section.
A pappus's attachment to its achene
is weak, a feature allowing for easy separation between the two units.
We examined anthocarps with a light table to verify presence of an achene
prior to planting.
mirabile is more delicate and lax, and has longer achene
stipes, straighter dorsal achene
margins, and shorter filaments (Small, 1900; Keener, 1976).
was considered germinated following emergence of the radicle and coleoptile, which usually occurred simultaneously.
Hemp is of high nutritional quality because it contains high amounts of unsaturated fatty acids, mostly oleic acid (18:1; 10-16 % content in the achenes
, depending on strain), linoleic acid (18:2; 50-60 %), alpha-linolenic acid (18:3; 2025 %), and gamma-linolenic acid or GLA (18:3; 1-6 %).
This species looks to be the most successful in the view of the number of achenes
per 1 [m.
tuberculate and papillate; glabrous; hypogynium with 6 globose tubercles in distinct pairs 3.
The feces contained no seed fragments apart from what appeared to be remains of the achenes
of an Asteraceae species in one sample.
30, divergent selection for achene
shattering in ruderal plants and achene
retention in domesticated plants is a second principal dimension of disruptive selection in Cannabis (reflective of a more general disruptive selection for existence in cultivation or existence in nature).
hallii in Mason County in 2000 while conducting a study on achene
morphology for the species (Smith et al.
Like nearly all other Nyctaginaceae, the fruit is an achene
, surrounded by an "anthocarp," a persistent accessory fruit that develops from the lower part of the uniseriate perianth.