Download PDF

INTRODUCTION TO BOTANY. 103
% Valvular, valvariSf valvata. When the petals, or other
parts, only touch each other at their edges. Compositse,
Araliaceae.
Induplicativa. When the petals, or other parts, only
touch other, and are then folded inwards. Clematides
viticellae.
Twisted, olvoluta, contoria. When the petals, &c. are
placed obliquely, and cover one another spirally. Dianthus,
Apocynise.
Alternate, alternaia, alternativa. When the petals, &c.
are placed in two or more rows, so that each petal of the
exterior rows cover two halves of the petals of the interior
rows opposite to them. Liliacese.
Quincuncial, quincuncialis. When there are five pieces,
two interior, two exterior, and a fifth, one side of which
covers the interior pieces, and the other side is covered by
the exterior. Calyces of rosee and dianthi.
Covei-ing, vexillaris. When one of the pieces, folded
inwardly on the middle rib, encloses all the others which
are placed opposite to each other. Leguminosas.
Snail-like, cochlearis. When one of the pieces, being
larger than the rest, and bent in a curve, covers all the rest.
Aconitum, many labiatse.
Tiled, imbricata, imbricativa. When the pieces are in
diverse series, and the exterior series being smaller than
the interior, cover them only at the base. Involucra of
many of the compositee, petals of double peionies.
Calycular, calycularis. The pieces being in two series,
the external covers only the base of the internal. Involucra
of the seneciones.
Enveloping, convolutiva. When each exterior piece in
succession is bent so as to cover all the pieces within it.
Petals of cheiranthus, and of many other cruciferse.
Rumpled, plicativa. The pieces are folded, or rumpled
up without any apparent order. Corollse of the papaveraceae,
Cistus, Punica.
These are the principal variations that have been hitherto
noticed, but the study of the flower-bud is still in its infancy,
although of great use in ascertaining the natural
affinity of plants.