566 PATAGONIAN EXPEDITIONS I BOTANY. 



9. DlSCARIA MAGELLANICA (MierS Sub 



Unarmed, finely pubescent ; with short internodes. Young leaves ovate- 

 oblong, obtuse at both ends, entire, or obscurely dentate, 5-6 mm. long. 

 Flowers 4-merous ; the young 2 mm. long, on peduncles as long. 



W. Magellan, on Cordilleras. 



10. D. SERRATIFOLIA (Vent). 



Armed with coarse spines ; leaves few, about as long as the internodes 

 (2 cm.), oblong to linear-oblong; apically emarginate and mucronulate ; 

 attenuate downwards, shortly serrate-toothed, the teeth glandular ; blade 

 thickish and nerveless. Intrapetiolar stipules confluent into a ring. 

 Flowers 1-2, axillary, crowded, 5-merous, shorter than the peduncles. 



(Chili, cultivated) Patagon., to the Antarctic region. 



4. COLLETIA Comm. 



Branches decussating, spinescent. Calyx-tube much produced above 

 the disk ; petals and stamens inserted in its throat. Ovary immersed in 

 the disk, becoming a dry coriaceous tricoccous drupe ; drupelets dehiscing. 

 Lea/less or with minute, opposite, 'deciduous leaves, and stipules not trans- 

 versely joined. Flowers 4-6-merous, below the spines on nodding, 

 i -flowered peduncles. 



Species 13, chiefly in extratropical S. Amer. (Fig. in Eng.. & Prantl, 

 iii, 5, 422, A. B.) C. spinosa Lam. of S. Brazil, has wood with purgative 

 sap, from which an alcohol is prepared as a medicine for intermittent 

 fevers. 



i. C. DONIANA Gay. (Ochetophila trinervis Poepp.) 



A tree with rather dense crown. Glabrous, branching, with long, leafy, 

 horizontal branchlets. Leaves opposite, ovate-elliptical, erect, attenuate 

 to the petiole, apically obtuse, or mucronate, entire, pale underneath, 

 3-nerved. Stipules small, lanceolate. Flowers solitary in the axils, or 

 fascicled, on short peduncles. Cocci smooth, cleft by a median slit. 



N. Patagon., by Rio Negro, and near Rio Colorado. "One of our ex- 

 amples had spines i cm. long in the axils of the decussate leaves; the 

 others had none." (Nied. & Lor.) In mountain shrubberies by Lago 

 Nahuel-huapi. 



