f a single carpel. But, not to
multiply technical names, this name is extended to all such fruits when
fleshy without and stony within, although of compound pistil,--even to
those having several or separable stones, such as the fruit of Holly.
These stones in such drupes, or drupaceous fruits, are called _Pyrenae_,
or _Nucules_, or simply _Nutlets_ of the drupe.

358. Of Dry fruits, there is a greater diversity of kinds having
distinct names. The indehiscent sorts are commonly one-seeded.

[Illustration: Fig. 376. Akene of a Buttercup. 377. The same, divided
lengthwise, to show the contained seed.]

[Illustration: Fig. 378. Akene of Virgin's-bower, retaining the
feathered style, which aids in dissemination.]

359. =The Akene or Achenium= is a small, dry and indehiscent one-seeded
fruit, often so seed-like in appearance that it is popularly taken for a
naked seed. The fruit of the Buttercup or Crowfoot is a good example,
Fig. 376, 377. Its nature, as a ripened pistil (in this case a simple
carpel), is apparent by its bearing the remains of a style or stigma, or
a scar from which this has fallen. It may retain the style and use it in
various ways for dissemination (Fig. 378).

360. The fruit of Compositae (though not of a single carpel) is also an
akene. In this case the pericarp is invested by an adherent calyx-tube;
the limb of which, when it has any, is called the PAPPUS. This name was
first given to the down like that of the Thistle, but is applied to all
forms under which the limb of the calyx of the "compound flower"
appears. In Lettuce, Dandelion (Fig. 384), and the like, the achenium as
it matures tapers upwards into a slender beak, like a stalk to the
pappus.

[Illustration: Fig. 379. Akene of Mayweed (no pappus). 380. That of
Succory (its pappus a shallow cup). 381. Of Sunflower (pappus of two
deciduous scales). 382. Of Sneezeweed (Helenium), with its pappus of
five scales. 383. Of Sow-Thistle, with its pappus of delicate downy
hairs. 384. Of the Dandelion, its pappus raised on a long beak.]

361. =A Cremocarp= (Fig. 385), a name given to the fruit of Umbelliferae,
consists as it were of a pair of akenes united completely in the
blossom, but splitting apart when ripe into the two closed carpels. Each
of these is a _Mericarp_ or _Hemicarp_, names seldom used.

362. =A Utricle= is the same as an akene, but with a thin and bladdery
loose pericarp; like that of the Goosefoot or Pigweed (Fig. 386). When
ripe