44 



O 



Ordo CLXVL 



Endl. Gen. 70. Lindl. Veg. Kingd. 223. Miquel, Monogr. Cycad. 1842, cum tjibb. 8 ; Prod. Cycad. 



1861. Regel. Cycad. Gen. et Sp. in Act. Ilort. Petrop. iv. 



Fhres dioici, strobilacei. Penanthktm deest in utroque sexu. Fl. ^ : Strohili apicem 

 versus trunci v. caudicis subterminales, solitarii, rarius plures, oblongi ovoidei v. cylin- 

 dracei, rarissime subglobosi ; sqiiampe crasse coriacesej alternatiin multiseriatte imbrica- 

 tsecLiie, v. verticaliter snperpositre et valvatim jxixtaposita;, dorso loculos polliuiferos 

 gerentes. Loculi polUniftrl sessiles v. breviter stipitati, sine ordine aggregativ. 2-4-natim 

 interdum stellatim dispositi, oblongi obovoidei v. subglobosi, coriacei, rima longitudinal! 

 dehiscentes ; pollen ellipsoideuin v. subglobosum. Fl. $ : Strohili quam in mare sapping 

 crassiores j squamse pariter multiseriatiui imbricatfe v, superpositfe, in Cycade valde 

 ulongatse, margine 2-pluri-ovulifer3e, apicc in laniinam planam serratam pectinatam v. 

 fimbi'iatam dilatatte ; in generibus caiteris fere omnibus squamaa breves plus minusve pel- 

 tatse, pelta magna ssepe inordinate incrassata, apice truncata v. varie producta^ basi juxta 

 stipitem ufcrinque 1-ovulifera. Omda orthotropa, sessilia v. subsessiliaj in Cycade erecto- 

 patentia, in generibus cseteris axim strobili v. deorsum spectantia ; integumentumunicum, 

 niicropylem versus iii tubum brevem productum ; nucleus apice tantum liber. Seniina 

 magna, globosa ovoidea v. oblonga, teretia v. obtuse angulata ; testa extus carnosa^ carne 

 tenui aurantiaca v. rubra, intus Crustacea v. ossea, basi foraminibus vasiferis percursa et 

 strato vasculari interiore instructa. Endospermmm crasse camosum, superne tegumeuto 

 men^branaceo quasi pileajum, imo apice ad situm radicuhe spongiosum. Embryo in parte 

 superiore endospermii axilis, subcylindraceus ; cotyledones omnino.v. basi excepta con- 

 ferruminati ; radicula supera, obtusa, in filum spiraliter tortum desineng ; phimula 

 squamosa, germinatione e fissura cotyledonum erumpcns. 



Plantie perennes, gumma ecatentes, aliio liujiiiles rhizomate v. caudice nudo lobato 

 ramoso v. simplici, alia? trunco humili v. elato donatse ; truncus indivisus v. raro f urcatus v. 

 gemmas foliaceas emittcns, apice vegetans, basibus foliorum et prophyllonuu persistentibus 

 dense quasi corticatus ; systema vasculare ex annulis libri et ligni mcd\dlam amplam amy- 

 laceam cingentibus, annulis anno luiico nou respondcntibus ; medulla interdum fibrin 

 lignosis instructa ; radices fibrosi, iibria interdum massas coralliformes partim epif^a'as 

 denique gemmiferas emittentibus. Folia bifonnia, prophylla et frondosa, scriebus 

 alternis provenientia ; prophylla ante frondes et strobiles evoluta, ovato- v. lineari- 

 lanceolata v. subulata, siepissime lanuginosa ; folia normalia v. simul v. unum post alteram 

 evoluta, exstipulata, pinnatifida pinnata v. rarissime bipinnatisecta, petiolo basi articu- 

 late, vernatione recta, rarissime inflexa ; segmenta (v. pinnce) opposita et alterna, 

 vematione recta et imbricativa, v. in Cycade circinnatim involuta et medio coatata, c^eterum 

 enervia ; in Stangeria costata et nervis trans\-ersis instructa ; in generibus cjeteris nervi 

 paralleli simplices v. furcati. Strobili sessiles v. pedunculati, ^ antliesi peracta decidni ; 

 $ in Cycade centrales, vegetatione trunci per axim ejus ulterius progredienda et squamas 

 fructiferas aniovente ; in generibus aliis omnibus post anthesin decidui. Semina ma^Tia 

 bilobasilari v. subbasilari lato. 



Species ad 7o, maxima copia rcgioncs tropicas utriiisque orbis, et temperatas Africse australis et 

 Australiit' incokntes, una civitates australioros AiuerioK borculis, altera Japoniam habitantes. 



Ordo inter Gymmospermeas distinctissimus, quoad organa sexuaiia insigniter homomorphus, 

 Co7iiferis magis quam Gmiaceis affiiiis, ab utroque tamcn ordine tarn habitu quam charaoteribus 

 floralibus abimde diversus. 



1 



CONSPECTUS GENERUM. 



r ■ 



Tribus Z. Cycadeae. Strobilus $ tcrminalis, post anthesin prolifoinis; squam:e clun^at* 

 marginibiis 2-pluri-ovulali3. Ovnla erceto-patentia. Truncus cylindraceus, basibus persisteutibus 



