What's the difference between awnless and beardless?

Awnless

Definition:

Example Sentences:

(1) Plants grown in the 30-km zone of the plant after its emergency are determined to have high frequency of chromosome aberrations reaching 2.666% in rye and 1.075-2.572% in wheat and 2.235-3.187% as dependent on the variety, biotype (awnless, semi-awned and awned) and places of occurrence.

Definition:

(a.) Without a beard. Hence: Not having arrived at puberty or manhood; youthful.
(a.) Destitute of an awn; as, beardless wheat.

Example Sentences:

(1) Other abnormal features in the family included precocious adrenarche, beardless males, eunuchoidism, and prepubertal grand mal seizures.
(2) A zoometric and yield study of the domestic Salvadorean hog in its three representative types: "chino" or beardless (CH), "negro" or black (N) and "parchado" or patched (P) in the birth-to-sacrifice stages, as well as in the carcasses, was carried out.
(3) Four of the species extinct in England also became extinct globally: the penguin-like great auk; Mitten's beardless moss; York groundsel, a weed only discovered in the 1970s; and the Ivell's sea anemone, last seen in a lagoon near Chichester.
(4) You may not agree with beardless election winners such as Barack Obama, Bill Clinton, George W Bush and Tony Blair, but there's a reason that William Howard Taft was the last US president with facial hair in 1913: beards were seen as being the preserve of hippies and communists, shaving a sign of respectability.