592 PATAGONIAN EXPEDITIONS: BOTANY. 



Color beautiful dark-green. Flowers rare, with white petals, externally 

 green ; and with red-topped green scales imbricating the floral tube. 

 (Brazil) ; common by Rio Negro, N. Patagon. 



2. CEREUS DUSENI Web. 



Small, 20-60 cm. high. Stem 6-8-costate, the cushions rather remote, 

 with many spines. Long, central spines 1-3, erect, uncinate at apex ; 

 shorter radiating spines 6-10, acute. 



N. Patagon., by Rio Negro; Chubut, rocky precipices near Trelew. 



"A most distinct species, near C. bertinii Cels." (Speg.) 



3. C. LAMPROCHLORUS Lem. 

 C. LAMPROCHLORUS SALINICOLA Speg. 



Trunk cylindrical, 59-150 cm. long, 7-10 cm. thick, apically rounded, 

 erect, not branching, but basally proliferous, very green. Costa 1012, 

 obtusely rounded. Areoles hemispherical-orbicular, white velvety at first ; 

 subsequently fuscous, having V-formed sulci above. Spines i4-i6(-2o), 

 ochroleucous, of which 4-5 are slightly stouter. Flowers with scent of 

 roses, solitary in the upper lateral areoles, large (24 cm. long), with sub- 

 globose ovary. Petals green-reddish externally, white internally. Stamens 

 many, 2-seriate, some deflexed, others erect and white like the 1 5-cleft style. 



N. Patagon., between Rio Negro and Rio Colorado ; Bahia Blanca. 



4. C. PATAGONICA Web. 



Fruit ovate, dry, white to pink, with short, dense, white villosity and 

 fine, blackish setulce, 5-15 mm. long. Seeds black, glabrous, areolate. 

 S. Patagon., near Sta. Cruz. 



2. ECHINOPSIS Zucc. 



Stem depressed, costate, globose or cylindrical. Calyx-tube long, pul- 

 villigerous ; the lobes numerous. Stamens 2-seriate, the outer adnate to 

 the calyx, the inner free. Ovary covered with setae. Berry scaly. Coty- 

 ledons small, connate. 

 Species 10. 



E. LEUCANTHA Walp. (Pfeiff. sub Cereus}. 



Stem not richly developed, globose or ellipsoid, ashy-green. Spines 

 bent, very large, over 2 cm. long. "Honey-yellow." Flowers large, 

 white or subrubescent. 



