il8 CLXIV. GNETACE^. 



1. -WelwitscMa, JIool, /, in Trans. Linn. Soc. xxiv. i. t, 1 ad 14. (Tumboa^ Welw. 

 olim in Diuriis nonnullis IIortul.)—¥love& dioici, utriusque sexus in spicis amenti- 

 fonnibiis intra bracteas squamiformes oppositas v. rarius ternatim verticillatas qiiadri- 

 fariam rarius sexfariam imbricatas solitarii, sessiles. Fl. <J : Perianthium laxe mem- 

 branaceum, compressum, breviter 2-lobumj lobLs latis valvatis postico et antico, bracteolis 

 2 lateralibus carinatis perianthio vix brevioribns stipatum. Staminnm filamenta in tubum 

 laxum exsertum apice interantheras truncatum alte connata; antheras 6, ad apicem columnse 

 breviter stipitatse, subglobosBSj vertice poris 3 mox in rimas breves confluentibii s dehiscentes. 

 Intra tubum adest ntriculus membranaceus (o-\'Tili integumentum, Hook, /.; ovarium 

 imperfectum, M^Nah) in collum longe tubulosuin flexuosum apice in discum latum 

 concavxim inter antheras dilatatum productus ; intra utrieulum nucleus ovoideuSj obtusus 

 V. breviter acuminatuSj nncleo ovtili florum foemineorum similis sed sterilis. Fl. $ : 

 Ovulum utriculo duplici inclusum; utriculu.s exterior (perianthium?) planus, latus, 

 membranaceo-fibrosus, apice foramine miiiuto pervius, lateribus utrinque in alam latam 

 tenuem squamse amenti appressam dilatatis ; interior (ovuli integumentum) tenuiter 

 membranaceus, basi ovulo adnatus, supeme ab eo liber, in tubum longum flexuosum 

 superne snbulatum e perianthio ultra squamas amenti longe exsertum vertice minute 

 2-dentutum productus ; ovulum ipsum (ovuli nucleus) sessile, ovoideo-oblongum, obtusum. 

 Fructus sub squamis amenti siccus, compressus, 2-alatus, utriculo exteriore floris $ aucto 

 fibroso cieterum immutato, interiore membranaceo albumen laxe involvente. Embryo in 

 centro albuminis granulosi linearis, teres, cotyledonibus 2 parvis sibimet arete applicitis, 

 radicula lorgiore supera apice canioso-incrassata. — TrunciTS lignosus, longasi'vus, crasso- 

 conicus, vertice plano-truncatus, supra terram parum prominens, pedes plures diametro 

 attingens, prreter folia primordialia e cotyledonibus accreta aphyllus. Hsec tamen ad 

 marginem trunci opposita, patentia, persistentia, demum pluripedaliaetinsegmentalonga 

 dilacerata. E vertice piano truiici oriuntur inflorescentiss raarginales aphylhe, rigide 

 diehotoiiie ramosai, squamis oppositis ad dichotomiiis vaginantibus. Spicoe auientlformes, 

 coloratse, ^ ad apices ramulorum v. in dichotomiis sessiles fasciculatce, l-l^ pollicares, 

 5 pauciores, majores, crassiores, utplurimum breviter pedunculatte. Squamse utriusque 

 sexus arete imbricatie, antlierte solre in ^j tubuli in $ j e squamis prominentes. 



Species 1, regioniim aridariim Afncae tropiese aiistro-occidentalis incola. Parlat.in DC. Prod. 

 xvi. ii. 3.'>9 (partium interpretations a nostra valde discrepaiite). M'Nab, in Trans. Linn. Soc. xxviii. 

 507, t. 40. Stra.sh. C'onif. 141, t. 18 ad 20. De cryetallis in ligno WelwitschicE copiosissimis cfr. 

 Solms-Lauhach in Eot. Zeit. 1871, 509. 



2. Ephedra, Linn. Gen. n, 113G. (Cha'tocladus, Senil. sen Nels. Pin. 161.) — Flores 

 miisexuales, s^epius dioici, intra bracteas oppositas decussatim imbricatas solitarii. Fl. ^ 

 in spicula oo : Perianthium tenuiter membranaceum, laxum, apice breviter 2-lobum, lobis 

 latis valvatis postico et antico, ebracteolatum. Stamina in fundo perianthii affixa, 

 filamentis in columnaui apice exaertam connatis ; anthers; ad apicem columnae 2-8, 

 sessiles, 2-loculai*es, loculis vertice poro terminali mox in rimam extenso dehiscent ibus. 

 Fl. $ in spicula intra bracteas summas, solitarii v. gemini, terminales, bracteis exterioribus 

 vacuis : Ovuli nucleus sessilis, ovoideus, utriculis 2 apice foramine parvo perviis inclusns ; 

 utriculus exterior (perianthium ?) carnosulus, apice breviter acuminatus ; interior mem- 

 branaceus, nucleo vix basi adhsereus, ultra nuculam in tubulum tenuem longe exsertum 

 siiperne 2-lobum v. uno latere fissum productus. Fructus drupaceus, oblongus, indehis- 

 cens, strato exteriore canioso, interiore crustaceo v. indurato, membrana intima tenui hya- 

 lina (ovuli utriciUo interiore) albumen involvente, srepequo tubulo persistente coronata. 

 Embryo albumine camoso parum brevior, cotyledonibus oblongis semiteretibus radicula 

 Rupera (in peminibus examinatis) vix brevioribus. — Frutices aphylli, erccti v. scandentes, 

 fasciculato-ramosissimi, ramis nodosia articulatis, vagiiiis ad nodos minimis v. utrinque 

 in squauiulas lineares oppositas productis. Florum spiculse parvse, subglobosse, in axillis 

 vaginarum pedunculatie v. ad apices ramomm paniculatao. Bractete spicularnm (^ omnes 

 floriferre. In spiculis $ lios nnicus tcrminalis subtcres, v. flores 2 faciebus interioribus 

 complanatis sibimet arete appliciti, BractecB exteriores vacuse, decussatim imbricata?, v. in 



