INFLORESCENCE. 



101 



open first, as in the Plantain (Fig. 136), and the peduncle 

 continues to grow in- 

 definitely until its 

 strength is exhausted. 

 Indefinite inflorescence 

 is expressed in tlie 

 Ament or Catkin; 

 Cone ; Corymb ; Gal- 

 bule ; Head ; Panicle ; 

 Raceme; Spadix; 

 Spike ; Thyrsus (given 

 alphabetically to assist 

 the memory). Indefi- 

 nite inflorescence is 

 called racemose, because 

 the raceme is one of its 

 best illustrations. In 

 development these vari- 

 ous types rank as fol- .rie- 139.-1. Umbel of Foors Parsley (^(tesacyno- 

 J r pivm). 2. Lf. aud «mb. of common Parwley {Pelro- 



loWS I ^elinnm mlivum) ; a, umbellet of Fool's Parsley ; 6, 



— -- , , ^,fr. of common Parsley ; c, fl. of same. 



kin. Rachis slender, lengthened ; flowers unisexual ; ses- 

 sile, or on very short pedicels ; with or without scales or 

 bracts ; deciduous when mature. Oak, Walnut (Fig. 67), 

 Willow, Birch (Fig. 69). 



212. Cone (^Strobile, Strobilum). A catkin with large, 

 thick scales, which become woody ; each scale producing 

 one, two, or more pistillate flowers, which are naked 

 ovules. It characterizes the Pines, Firs, etc., in Gym- 

 nospermse, which are called Coniferse, or Cone-bearers 

 (Fig. 46). 



213. Galbule. A short cone with fleshy or woody 

 scales, usually indehisoent. Cypress (Fig. 45). 



214. Spadix. Rachis thick, lengthened ; flowers uni- 

 sexual, sessile, or nearly so, apetalous or petalous ; spadix 

 usually with • a large enveloping bract, called a Spatha. 

 Arum, Palm. In the Palm the spadix has many 

 branches ; it is called a Regime (Fr.). 



215. Spike. Rachis usually slender, lengthened ; flowers 

 sessile, or nearly so, apetalous or petalous, unisexual or 



9* 



