753 HYDIIOCHAEITACEJ5. (FKOG's T.IT FAMILY.) 



Class II. *:i^I>0€^ENS or MONOCOTYl^EDOAi 8. 



Stems with no manifest distinction into bark, wood, and 

 pith; the woody fibres and vessels in bundles or threads, 

 Avhich are irregularly imbedded in the cellular tissue ; peren- 

 nial trunks destitute of annual layers. Leaves mostly paral- 

 lel-veined (nerved) sheathing at base, seldom jointed at base 

 where they join the stem, usually alternate or scattered, 

 entire. Tarts of flower usually in threes. Embryo with a 

 single cotyledon, and leaves of plumule alternate. 



Fig. 339. 



(rt b c) Seed of a monocotyledon in 

 germination, showing («) cotyledons, 

 (b) seed coat, (c) radicle, (a- b- c) The 

 same in a more advanced state, showing 

 I a) two stem-leaves emerging from the 

 cotyledon, {b-} and (c*) the roots developed 

 from the primitive radicle, {d) Longitudinal 

 and transverse section of a stalk of nraize, 

 showing the arransrenient ot the fibres and 

 vessels, (e) Similar sections of the trunk 

 of a kind of palm. (/) Cross section of an 

 exogen, for comparison. 



Order CV. HY1>R0CHARITACE^, L. C. Rich. 

 (Frog's Bit Family). 



Aquatic herhsj nnith dioecious or jyolijgamous^ regular 

 floioers on scajpe-Wke ])edxLncles from a sjKtthe, and simjjle or 

 douhle floral envelopes, loJdch m the fertile flowers are united 



