110 CONTRIBUTIONS 



ereclis, forma fructus unra ea coiiveniel. Foliis lationbus, friiclilms majoribiis, forma 

 seminum atque eorum appetitiiculis loiigioribiis disliiicla. 



P. Gr/EBIana, sp. M. Gaules mimerosi, ililTiisi, adsc-endenles, inleriiodiis articii- 

 latis: folia verlicillala, laiieeolalo-liiioiria, iiiteriiddia ;ci|iiaiitia vel siiperaiitia: facemi 

 arciiati; pedicelli brèves; alœ ovalœ: pulala sLi|)erioi'a rhomboidalia; antlierœ filanienla 

 libéra longitiidine aequanles. 



Tabula noslra XXX, fip;. Il : I, |ilaiita tota; 2, alae; 3, sppala exieriora; 4", pela- 

 lum sijperius ablatum; 4'', l'arina ablala sine crista; 5, aiidroceiim ; (J, pislilluni; 

 7, fructus cum duobus sepalis; 8, setnen. 



Radijc crassa, ramosa, siiiuala, arliculata, bninneo-nifa. E caudice nasctinlur cail- 

 les numerosi, adscendentes, dilTusi, curvali, slriati, subalali, internodiis arliculalis. 

 Folia omnia lanceolato-liiiearia, 4-5 vertirillala, ititeriiodia subiei|uantia vel siiperan- 

 tia, lenuissirae mucronala, punctata, IU-2()mni. loiiga. 1-2 mm. lala. ftoccwi graciles, 

 arcuati, elongali, sublaxiflori, 3-7 cm. longi. Flores albidi. Bracteœ persistentes vel 

 caducœ. Pedicelli brevet, demum penduli. Sejiula exieriora inaequalia; superius ellip- 

 licum, aliis duplo majus, nervis Iribus notatum; iaferiora uninervia. Alœ o^àlx, U'ian- 

 gulares, nervis tribus munilae; nervi latérales exlrinsecus simpliciter ramosi, ramis 

 liaud anastomosantibus. Aise carina paullo longiores. Carina cristata, appendiciilis, 

 simplicibus, paucis (5-7) formata. PeUila superiora fere usque ad basin libéra, rhom- 

 boidalia, lata, apice subserrulata. Antherœ, filamenta libéra longiludine aequantes. 

 Sliijmala cristata. Capsula orbiculari-elliplica, SiT3pe irregularis, glabra non alata, alis 

 paullo brevior haud latior. Setnina griseo-hirsuta. Canmcula biappendiculala. Appcn- 

 dicula descendentia, linearia, semen paullo superantia vel breviora. 



In basi Cerro Perron ap. Paraguari, n. 20G2. 



Species nova, in honorera celeberrimi chemici, Professoris G. Graebe, rectoris Uni- 

 versilatis Genevensis, gratissime dicata. 



P. Leucantha, A.-W. Bennel. Journal of Bot., 1879. Polyg. americ, p. 



A prœcedenti, foliis angustioribus, caulibus brevioribus, alis obovatis vel spalhu- 

 lalis sed non triangulari lanceolalis, semine subcurvato, appendiculis arcuatis, apice 

 latescenlibus, diversa. 



In speciminibus a cl. Balansa lectis, duœ varietates reperiuntur (in Herbario Mus- 

 Paris eaedem paginœ afïixse). 



Var. a (in Hb. Mus. sup.). 



Garunculae appendicula dimidium semen attingenlia vel paullo superantia. 



