The Manual of the Botany of the Northern United States / Including the District East of the Mississippi and North of North Carolina and Tennessee

by Asa Gray

SIGNS USED IN THIS WORK.

°, ´,´´ . The sign of degrees (°) is used for feet; of minutes (´), for inches; of seconds (´´), for lines,—the line being the twelfth part of an inch, and very nearly equivalent to two millimetres.

µ. In microscopic measurements, the conventional sign for the micromillimetre or the one-thousandth part of a millimetre = one two-thousandth part of a line.

♂ Bearing only stamens or antheridia.

♀ Pistillate or bearing archegonia.

? A mark of doubt.

! A mark of affirmation or authentication.

Figures or words separated by a short dash (–) indicate the extremes of variation, as "5–10´´ long, few–many-flowered," i.e. varying from 5 to 10 lines in length, and with from few to many flowers.

BOTANY
OF THE
NORTHERN UNITED STATES.

SERIES I.
PHÆNOGAMOUS or FLOWERING PLANTS.

Vegetables bearing proper flowers, that is, having stamens and pistils, and producing seeds, which contain an embryo.