290 MUSEO XACIOXAL DE BÜEXOS AIRES. 



foliis ovatis pusillis^ spinis 3, centrcdi erecta máxima applana- 

 tula lateralíbus subretrorsis ó-lO-plo minoríbus, florihus api- 

 calibus sessiUhus, ovario hrevi turhinato-hemispTiaericosquamo- 

 so, sqnamis ad axillas Jonge albo-harhatis setulisque paucis or- 

 natis, phyllis ohovatis extimis zt ve rubicundis, internis albis. 



Hab. Non rara j)assim cnm priore in aridissimis prope Tre- 

 lew, Chubut, Xov. 1897 ( J. Yalentin) et secus Eio Chubut, 

 aest. 1899(X. L). 



Ohs. E,adix cylindracea crebre ramosa (15-30 cin long. = 

 8-16 mm crass.) ocliroleuco-albescens; rami e eolio radiéis 

 saepius numerosi ereetiaseuli (8-20 em alt. =8-10 mm erass.) 

 mox undifjue dense ramoso- et ramuloso-intricati, caespites 

 ±: ve laxos (10-25 cm alt.) efforraantes, sordide fusco-einerei 

 obsolete squarrulosi, a ramululis abortivis saepe it ve tuber- 

 culatis; ramuli cylindracei v. clavulati (10-35 mm long. = 

 5-8 mm diam.) virescentes, deorsum leniter attenuati uudi v. 

 paree areoliferi; areolae subellipticae (2-2,5 mm diam.) trans- 

 versae parum iufossae, in j3rima juventute snbalbo-velutinae 

 dein denudatae fuscae; spinae e quaqne areola 3, centrali 

 erecta V. patente valida (2-6 cm long. = 1-1,5 mm lat. bas.) 

 crassa rigida dorso ventrique compressiila (rarius leniter sub- 

 canaliculata), lateralibus abruj^te refractis v. retrorsis subte- 

 retibus gracilibus brevibus (3-10 mm long. =0,3-0,5 mm 

 crass.), omues acutissimae primo albido-roseae v. subcremeae 

 dein cinéreo -riibicundulae postremo cinéreo -fuscae; folia in 

 areolis apicalibus e voluta cylindraceo-subovata (3 mm long. 

 = 1 mm crass.) subacutiuscula laete viridia mox decidua. 

 Flores in ramulis tuberculiformibus (5-10 mm long. =5-8 mm 

 crass.) subapicalibus acrogeni sessiles (20 mm long. et diam.), 

 ovario hemisphaerico-obconico (5-8 mm long. = 10-12 mm 

 diam.), extus squamis numerosis (10-15) triangulari-ovatis 

 carnosulis viridibus ápice purpureólis et mucronulatis subim- 

 bricatis vestito, axillis squamarum dense longiusculeque albo- 

 villosis, inferís et mediis saepe setulis v. aculéis 1 \. 2 ( 3 - 10 

 mm long.) subflexuosis pallide carneis armatis; phyllis late 

 obovatis (10-15 mm long. =^8-12 mm lat.) antice obtusissi- 

 mis ± ve retusis, externis saepe mucronulatis pallide rubicun- 

 dis, internis albis v. leniter sublutescentibus; staminibus <=<:, fi- 

 lamentis glabris albis, antheris flavis; stylo terete (6 mm long. ) 

 albido stamina superantia, ápice stigmatibus 5 brevibus pur- 

 pureólis (2 mm long.) obtusis coronato. Fructus adliuc mihi 



