yoo ZOSTER A 



Infl. a flattened spadix, enclosed at flowering time in a spathe 

 (the sheath of the uppermost 1.). This is open down one side, and on 

 the corresponding side of the spadix the fls. are borne, the essential 

 organs forming two vertical rows, each composed of a cpl. and a sta. 

 alt. On the outer side of the spadix next the 

 sta. is often a small 1. (retinacnltim of systematic ret ^J; ^ ' 

 works). The midrib of the cpl. faces outwards. ' cp i' sta ] ret. 

 Each cpl. contains one ovule and has two flat 



stigmas. The sta. consists of two half anthers, joined by a small 

 connective. It is difficult to decide what is the actual 'flower' in 

 this plant ; the usual view is that each sta. witli the cpl. on the same 

 level forms a fl., the retinaculum representing the bract. 



Fert. peculiar, Z. being one of the water pi. most completely 

 modified from the ancestral land-pi, type. Fl. submerged like the 

 rest of the pi. The pollen grains are long threads of the same specific 

 gravity as salt water, so that when discharged they float freely at any 

 depth. The stigmas are very large, and thus have a good chance of 

 catching some of the grains. The whole mech. is similar in principle 

 to that of a wind-fert. pi. Fr. an achene. In winter it hibernates 

 without any special modification. The pi. is largely used for packing 

 glass, stuffing cushions, &c.,.esp. in Venice. [For further details see 

 fam., and Schenk's Wassergewachse. ] 



Zosterella Small. Pontederiaceae. i Pennsylvania. 



Zoysia Willd. Gramineae (3). 3 Masc. Is. to New Zealand. 



Zozimia Hoffm. Umbelliferae (ill. 6). 6 W- As. 



Zschokkea Muell.-Arg. (Lactnellia BH.}. Apocynaceae (i. i). 8 trop. 

 S. Am. 



Zuccagnia Cav. Leguminosae (n. 7). i Chili. 



Zuccarlnia Blume. Kubiaceae (i. 8). i Java. 



Zuccarinia Maerklin. Inc. sed. Nomen. 



Zuckia Standley. Chenopodiaceae (A), i S.W. U.S. 



Zuelania A. Rich. (Casearia p.p. BH.}. Flacourtiaceae (7). i W.I. 



Zwackhia Sendtner. Boraginaceae (iv. 5). i S.E. Eur. 



Zwartbast. Royena lucida L. 



Zwingera Schreb. = Simaba Aubl. (Simarub.). 



Zycona O. Ktze. = Allendea La Llave (Comp.). 



Zygadenus Michx. Liliaceae (i). 12 N. Am., Siberia. 



Zygalchemilla Rydberg (Alchemilla p.p.). Rosaceae (in. 5). i 

 trop. Am. 



Zyganthera N. E. Br. (Pseitdohydrosme p.p.). Araceae(iv). i Gaboon. 



Zygella Sp. Moore. Iridaceae (n). i Matto Grosso. 



Zygia Walp. = Albizzia Durazz. p.p. (Legum.). 



Zygo- (Gr. pref. ), yoke-; -morpMsm, symmetry about one plane 

 through axis only, cf. floral diagrams of Labiatae, Papaveraceae, 

 Scrophulariaceae ; usu. antero-post., it is diagonal in Solaiiaceae, 

 transverse in Atiigozanthos, Haemodoraceae, some Papaveraceae, right 

 and left-handed in Cassia, Exacttm, Saintpanlia ; -te, the cell pro- 

 duced by the union of the sexual gametes. 



Zygobatemannia x Rolfe, Zygocolax x Rolfe, Zygonisia x Rolfe, Zygo- 

 mena x Hort. Orchidaceae. Hybrids of Zygopetalum with Bate- 

 mannia, Colax, Aganisia, and Zygosepalum (Menadenium). 



