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"Ascidium of a Plant. Leaf of pitcher-plant (Nepenthes) with a winged petiole and terminating in an operculate pitcher."-Whitney, 1902

Ascidium

"Ascidium of a Plant. Leaf of pitcher-plant (Nepenthes) with a winged petiole and terminating in an…

"Ovaries of Queen and Workers (Apis). A, Abdomen of queen, under side. P, Petiole. o, o, Ovaries. hs, Position filled by honey-sack. ds, Position through which digestive system passes. od, Oviduct. co.d, Vagina. E, Egg-passing oviduct. s, Spermatheca. i, Intestine. pb, Poison bag. pg, Poison gland. st, Sting. p, "Palps" or "feelers" of sting. B, Rudimentary ovaries of ordinary worker. sp, Rudimentary spermatheca. C, Partially developed ovaries of fertile worker. sp, Rudimentary spermatheca." — The Encyclopedia Britannica, 1910

Bee Ovaries

"Ovaries of Queen and Workers (Apis). A, Abdomen of queen, under side. P, Petiole. o, o, Ovaries. hs,…

The left is a transverse section of a petiole of the castalia group. The right is transverse section of a penduncle of the castalia group.

Castalia Petiole and Peduncle

The left is a transverse section of a petiole of the castalia group. The right is transverse section…

The left is a transverse section of a petiole of the lotos group. The right is a transverse section of a peduncle of the lotos group.

Lotos Petiole and Peduncle

The left is a transverse section of a petiole of the lotos group. The right is a transverse section…

<i>Chalybion caeruleum</i>. "A family of fossorial hymenopters, or digger wasps. The prothorax is narrowed anteriorly, and forms a sort of neck; the basal segment of the abdomen is narrowed into a long, smooth, round petiole; and the head and thorax are usually clothed with a long, thin pubescence. These wasps usually burrow into sand-banks, and provision their cells with caterpillars and spiders." &mdash;Whitney, 1889

Spider Huntress Wasp

Chalybion caeruleum. "A family of fossorial hymenopters, or digger wasps. The prothorax is narrowed…

"Leaf of a willow (Salix sp.). b, blade; p, petiole; s, stipules." -Gager, 1916

Willow Leaf

"Leaf of a willow (Salix sp.). b, blade; p, petiole; s, stipules." -Gager, 1916