INTRODUCTION. 



17. Knee-jointed, (geniculutm), when the stem is bent at a joint, like the kn 



« 4 « 



XliI 



ee. See Ulymus 



e joints. See Phleum nodosum. 



geniculatus. 

 18. Bulbiferous, (hulbifer), having bulbs, or buds, fixed at th 



The flower straw, (pedunculus), is the part which immediately supports the flower- it mav 

 be either a part of the principal straw, as in wheat, or barley, or composed of a number of p., 

 tial straws seated on the principal culm, (see Bromus steriUs); or these partial straws S^n 

 branched, as m Poa nervosa, and Trichodium rupestre : in the two last cases, they constitute what 

 is called a compound panicle. 



III. 



form of the X 



The leaves of grasses are all quite simple, or undivided, and, on that account, alFord but few 

 obvious characters of chstinction ; they vary, however, in respect of the form of their point or 

 apex, cu-cumference, situation, and surface-coverino-. 



The apex, or point, is either acute, (acufum)^,, in Poa trivialis; or obtuse, as in Poa pra^ 

 tensis. Ihe circumference has four varieties : 



1. Sword-shaped, (ensif^rn^e), an oblong leaf, growing gradually narrower towards the apex 



which is pointed. See Festiica cambrica. 



(^linearcy 



cceridea. 



See Sesleiia 



( siihiilatiim y 



Fringed, (cilmtum), when the edges are i 

 The surface of the leaves vary as follows : 



1. Channelled, (canaUculatum), when the middle rib of the leaf is furrowed, as in Pestuoa du- 



riUSCUfa. (H pnirec \ 



riuscida, (R. leaves.) 



2. Nerved, fwe;To«<m), when the vessels n.- T-iKc „^ + 1 1 , 



,^ ,. 1 , . ' '' ''^'' strongly marked, and run from the base 



to the apex, lengthwise, as in Bronms littoreus 



S. B-tle-shaped, Cse^aceumJ, when the leaves are nearly cylindrical, resembling swine's bristles, 



as ni jtestuca ovtna, "^ ' 



4. Flat, (planum), when the snvfapA r.f +i i r • 



J. mien surface of the leaf is even, without any furrows, dots, or raised 

 veins, as m P/>«^ ^^.^* — 



f 



In respect of situation, the leaf v 



aries : 



'■ ''!!"«/ rf'T^' '''"" "" """" "'' '° " '»''«*-' •"'"-" ^'"^ - '■-'■-ntal. a. 



^^^^ r 



2. Horizontal, Chorizontakl when th^ 1^. i i' . . 



3 T^nn^l ^ rl • r /\ *^'^^^^^^'S^^^^"^^% horizontal, as in i)«c/y.^^ 



o. XJunaled. ( Tascir.ularp \ wl^^v, +!,_ i . _ . u r 



a sheath. 



fvagina) 



S 



row in tufts, or bundles, ^sin Jgrosfisfascicularis. 



/ 



