1918] SCHNEIDER—SALIX 5 
Ovaria glabra, tantum pedicelli interdum pilosi; stigmata brevia; 
filamenta glabra, libera vel t—} coalita 
Folia lanceolata, oblanceolata rel anguste cesses soe ultra 
3plo longiora quam lata; amenta mascula 
vix plus quam 12 mm. crassa; filamenta basi pb i m. coallia: shies 
mata minima, stylis pluriplo breviora; bracteae pl. m. obovatae, 
apice valde obtusae vel truncatae............. 15. 9. lasiolepis 
Folia elliptica vel late elliptico-lanceolata, vix ultra 3plo longiora 
quam lata; amenta mascula crasse cylindrica, 1.5-2 cm. crassa; 
filamenta libera; bracteae oblongae, pl. m. acutae; stigmata 
mediocra stylis fere BOdUBONaA 6k cies s vavs 16. S. Rowleet 
Ovaria (in S. oxylepide ignota) villosa, stigmata lanceolata; filamenta 
basi pl. m. pilosa, libera 
Bracteae anguste lanceolatae, apice distincte acutae vel breviter 
ROW oe ee tn es 17. S. oxylepis 
Bracteae oblongae, apice pl. m. obtusae vel gue ea rarius 
BCUTIUIBCOING coe ies oe cd See eae s enews . paradoxa 
Inflorescentiae parvae, ut videtur vix ad 1 cm. longae; os visa nondum 
matura tantum ad 1.8 cm. longa (vide etiam S. Endlichii, in nota post 
OOM cl ho Pie, eae ee ey wes 19. S. cana 
Enumeratio sectionum specierumque 
“Sect. I. NIGRAE Loudon, Arb. Frut. Brit. 3:1529. 1838; 
SCHNEIDER, Ill. Handb. Laubh. 1:32. 1904.—Sect. AMYGDALINAE 
Ball in Coult. and Nels., New Man. Rocky Mt. Bot. 129. 1909, 
quoad S. nigra. 
The species belonging to this well distinguished section are 
S. nigra Muhl., S. Humboldtiana Willd., and S. Gooddingii Ball. 
ANDERSSON (K. Svenska Vet. Akad. Handl. 6:15. 1867; and 
DC. Prodr. 167:199. 1868) refers S. Humboldtiana to his section 
AUSTRO-AMERICANAE vel HUMBOLDTIANAE, but he also includes 
S. Bonplandiana Kth., which certainly does not belong to the 
Same group. S. nigra is included by ANDERSSON and other authors 
in sect. AMYGDALINAE (vel TRIANDRAE) together with S.amygdaloides 
And. In my opinion, S. nigra is much more closely related to S. 
Humboldtiana than to S. amygdaloides or any other species of sect. 
AMYGDALINAE., The species of sect. NIGRAE are exclusively 
American, and show no very close relationship to any other group of 
American willows or any section of those of the Old World. H. 
GARTNER (Vergl. Blattanatomie Gatt. Salix, Diss. Géttingen, 1907, 
