SECTION 14.] 



TRUIT. 



121 



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 (Pig. 378). 



360. The fruit of Compositse (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 appKed to all forms under 

 which the limb of the calyx of the " compound 

 flower " appears. In Lettuce, Dandelion (Mg. 



384), and the like, the achenium as it matures tapers upwards into a slender 



beak, like a stalk to the pappus. 



361. A Cremooarp (Kg. 385), a name given to the fruit of Umbelli- 

 ferse, consists as it were of a pair of akenes united com- 

 pletely in the blossom, but splitting apart when ripe 

 into the two closed carpels. Eacli of these is a Men- 

 carp or Hemicarp, names seldom used. 



362. A Utricle is the same as an akene, but with 

 a thin and bladdery loose pericai-p ; like that of the 

 Goosefoot or Pigweed (Fig. 386). When ripe it may 

 burst open irregularly to discharge the seed ; or it may 

 open by a circular line all round, the upper part fall- 

 ing off like a lid; as in the Amaranth (Pig. 387). 



363. A Caryopsis, or Grain, is like an akene with 

 the seed adhering to the thin pericarp throughout, so 



that fruit and seed are incorporated into one body ; as in wheat, Indian 

 corn, and other kinds of grain. 

 364. A Nut is a dry and indehiscent fruit, commonly one-eelled and one- 



Fio. 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 (Heleniuiii), 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. 



Fig. 385. Fruit (cremocarp) of Osmorrhiza; the two akene-like ripe carpels sep- 

 arating at maturity from a slender axis or carpophorse. 



Fig. 386. Utricle of the common Pigweed (Chenopodium album). 



Fjg. 387. Utricle (pyxis) of Amaranth, opening all round (circumscissile). 



