SPEGAZZINI: NOVA ADDENDA AD FLOEAM PATAGOISTICAM. 217 



Ohs. Species e descriptionibas et iconibus auctorum oiniiino 

 iiideterminabilis, pessime semper defiíiita, cotyledonibns exi- 

 mie incninhentihus a genere Brassica et a genere Árahide 

 certe removenda et fere sine dubio ullo ad Sisymhriuin adscri- 

 benda. 

 772, Sisymbrium Ameghinoi Speg. (n. sp.). 



Diag. Perenne ylaherrimum carnoiulum^ ccmlihus e eolio 

 mimerosis simplicihus V. parce ramosis fere a had flori-fructi- 

 feris, foliis subfasciciilatis ómnibus radkalihus v. hasin cmilium 

 vestientihus, circumscriptione ohíanceolatis, limbo remote pin- 

 nati-fido, lobis brevibus latís obtusis, petiolo limbum subaequante, 

 floribiis longe racemosis parvis, sepalis ovatis obtusis glabris, 

 petalis albís vix longioríbus, siliquis subtorulosis erectis adpres- 

 sis majusculis, petiolo trijjlo breviore suffultis, stígmate crasso 

 bilobulato subsessili coronatis, seminibus l-sei'iatis. 



Hab. lu aridis saxosis seciis E,io Chico, Cliiibut, aut. 1900 

 (C. A.). 



Obs. Radix (an rliizomatis rami?) longinscula cylindrica 

 crassa (20-60 mm long. = 5-6 mm diam.) lignosa simplex non 

 barbata, cortice crassiusculo e cinéreo subvirescente non v. 

 minutissime rimnloso-reticulato vestita, axi lignoso pallide 

 subflavescenti-albido donata. Canles ad apicem radiéis nume- 

 rosi, adscendenti-erecti breves v. elongati (3-25 cmlong. = 

 1,5-3 mm crass.) glaberrimi primo carnosuli lierbacei dein, 

 basi praecipue, lignosuli, teretes simplices v. rarissime prope 

 basin ramis alternis 1-3 subaeqiiilongis non v. vix patentibns 

 ornati, ad tertinm inferum tantum foliosi, ceterum laxe ad- 

 presseque flox-i-fructiferi. Folia ad basin caulium subfasci- 

 culatim V. subrosnlatim congesta, panca caulina alterna erec- 

 tinscula, omnia sul)carnosulo-crassiuscula glaberrima viridia 

 V. obsoletissime subglaucescentia, circumsoriptione oblanceo- 

 lata (50-150 mm long. = 10-35 mm lat.), limbis obtusinscule 

 acutatis 23Ínnatifidis (30-80 mm long.), lobis 3-4-jugis ojíjío- 

 sitis V. suboppositis patentissimis superis brevioribus (sub- 

 dentiformibns mox cnm rachi latiore confluentibus) inferís 

 sensim profundioribus atque angustioribus (2-15 mm long. = 

 2-5 mm lat.) ut rachi, obtusis integerrimis sinubns latissimis 

 obtusissime rotundatis separatis, in petiolis snbaequilongis (20- 

 70 mm long. = 1,5-2,5 mm lat.) latiuscule subsemiteretibus, 

 basi snbsemiamplexicanlibiis plañe exauriculatis panlatim 

 productis. Flores parvi (3-4 mm long. etlat.) primo subco- 



