06 CXXXIV. POLYGONACE^. " [BupolygonecB. 



tracta; alse ad contractionem interruptse v. divisse, in parte siiperiore v. rostro alls basalibus 

 nimc directe siiperpositfe, nunc mice sub rostro distorto basalibus altern^e. Semen basi dila- 

 tatnm, concarum v. 3-gonum, superne rostratum ; embryo excentricus, leviter curvus, 

 cotyledonibus oblongis radicula multo brevioribus. — Frutices ramis rigidis virgatis. 

 Folia altema v. ad nodes fasciculata, parva, linearia v. spathulata; ocrese brevissim as, 

 fere ad linoam transversam demum evanidam reduct^. Flores parvi, ad nodos ciim foliis 

 fasciculati intra bracteam ocreiformem solitarii v. gemini, pedicello breviter filiformi 

 ebracteolato. 



Species 5 v. 6, Orientales, usque ad Affghauistan extensse. Meissn. in DC. ProcL xiv. 31. Boiss. 

 Fl. Or. iv. 1001. Wight, Ic, t, 1809. 



12. Atraphaxis, 7>inn. (?en. n. 449. — Flores hermaphroditi. Perianthium4-5-partitum, 

 segmentis 2 exterioribus srepius minoribuSj fructiferum auctum, seginentis interioribus 

 V. omnibus scariosis nucem obtegentibus. Stamina G-8 rarius 9, filamentis ima basi 

 ssepius dilatatis ; antherse ovata). Ovarium compressum v. 3-gonum ; styli 2 v. 3, 

 brevissimi, late clavato-stigmatosi. Nux perianthio accreto inclusa, lenticularis v. 3-gona. 

 Embryo excentricus, incumbenti-curvulus v. fere rectus, cotyledonibus angustis, radicula 

 breviore ascendento. — Frutices rigide ramosissimi, ramulis ssepe apice spinescentibus. 

 Folia alturna v. ad nodos fasciculata, angusta v. parvula, s.^epe rigidula, uninervia 

 reticulato-venulosa v. subpennivenia ; ocrete membranaceo-scariostej utrinque in stipulam 

 productfe. Flores ad nodos ssepius fasciculati^ intra bracteam ocreiformem solitarii 

 V. geminij pedicellis filiformibus articulatis ebracteolatis. 



Species enumeratse 17, sed plures inter se segre distinguend^, Asiae mediae et oceidentalis incolte, 

 una a Schweinfurthio etiam in .Slgypti desertis lecta. — Meissn. in DC. Prod. xiv. 74. Boiss. Fl. 

 Or. iv. 1020. L'Her. Stirp. Nov. t. 14. Wats. Dendrol. Brit. t. 119. Ledeb. Ic. Fl. Boss. t. 411. 

 Jwuh. et Spack, III. PL Or, t. IIO ad US. Bot. Mag. t. 1065 {Polygonum). 



Tragoptron, Bieh. Fl. Taur. Cauo. iii. 284. Ledeh, Ic. Fl. Boss, t, 422, 426, a Jaubert et Spach 

 uti a Meissnero pro sectioue Atraphaxeos retinetur, floribus 5-meris 8-andris 3-gynis, dum in specie 

 typica ssepius 4-nieri G-andri 2-gyui sint, sed in T. variahili,Sifixdi, a Boissiero ad A. Billardierl, Jaub. 

 et Spach, vix ab A. spinosa, Linn. disLinctam reducta, variant 4- v. 5-meri, 6-9-andri, 2- v. 3-gyni, 

 et genus in integrum servatum naturale est. 



13. Oxygronum, Burch. Trav. i. 548. (Ceratogonon, Meissn. in Wall. PI. As. Bar. iii. 



63.) — Flores polygami, ad axillas bractearum pauci. Periantliii tubus in fl. f^ supra 



ovarium constrictus, in fl. ^ vix uUus ; limbus 5-partitus, segmentis 2 exterioribus paullo 



minoribus, post anthesin immutatus, marcescens. Stamina 8, limbo affixa, filamentis 



filiformibus ; antherse oblongaj. Ovarium tubo perianthii inclusum ; styli 3, filiformes, basi 



ssepe connati, apice capitato-stigmatosi. Perianthii fructiferi tubus accretus, induratus, 



3-gonu8, an^ilis interdum alatis, faciebus ssepe prope basin v. medium versus tuberculo 



V. calcare patente duro instructis ; limbus marcescens, ad apicem tubi diu persistens 



V. demum deciduus. Nux tubo clauso arete inclusa at libera, angusta, testa fere mem- 



branacea. Embryo in albumine subcentralis, rectus, cotyledonibus planis late oblongis, 



radicula brevi supera. — Herbae annuai v. basi perennes, ramis elongatis. Folia altema, 



Integra sinuato-dentata v. irregulariter pinnatifida, superiora floralia mox ad bracteas 



yaginantes reducta; ocrese membranaceo-scariosse, truncatse, margine ssepe ciliatse. Racemi 



spicif ormes terminales, elongati, virgati, bracteis floriferis dissitis. Pedicelli per anthesin 



exserti, fructiferi recurvi. 



Species ad 7, Africse orientalis tropicse et australis incolae. Meissn. in I)C. Prod. xiv. 38, 3d 

 (genera 2 ad specimina manca perperam distincta). Boj. in Ann. 8c. Nat. ser. 2, iv. i. 9 

 (Polygonum). 



Grenus ab omnibus distinctiBsimum, perianthio tubo supra nucem clauso E7nici accedit, embryo 

 Bheif styli et chardctcrus plures Polygoni, Alse et calcaria perianthii fructiferi (nee nucis) in 

 oodem specimine variant, imprimia in 0. ulaio, Burch., ubi ala; nunc latse nimc vix ad angulos 

 prominentes, calcaria lougiuscula v, ssepius ad tubercula reducta v, omnino uulla. 



