TERMINOLOGY. 12i 
of this are found in the species of Orchis, and par- 
ticularly in all very small seeds. In these_plants the 
seeds are inclosed as in a bag*. 
2. The pappus is the calyx of each particular 
floret inclosed in a common perianth, (§ 70). Dur- 
ing the time of flowering, the pappus is in most 
plants so very small that its distinguishing characters 
cannot ‘well be observed, when the seed ripens it 
attains its perfection, and then exhibits the following 
varieties : | 
a. Sitting, (sessilis), when the pappus sits on 
the top of the seed, without any foot-stalk, 
fig. 189. 
&. Stipitate, (stipitatus), when it is supp ported on 
a pedicle, fig. 185, 186, 
¢ Abiding, (persistens), when it is so closely 
attached to the seed that it does not fall off. 
d. ‘Caducous, (caducus s. fugax), when it falls 
off upon the ripening of the seed. 
e. Calycled, (calyculatis Ss. marginaius), when a 
membranaceous rim vises over the seed; this 
is either, 
a. Whole, (integer), when the rim is not in- 
dented, and surrounds the top of the seed, 
asin Tanacetum, Dipsacus ; or, 
B. Halved, (dimidiatus), when the rim sur- 
* The Arillus does not surround the seeds alone; some- 
times it even incloses the pericarpium, as-in the nutmeg, My- 
ristica moschata ; what is called mace is an arilhas which sut- 
roynds the fruit, fig. 206. 
rounds 
