Haxobook of Tukks of Till-: Xoi;iin;i;.\ Staiks a.nd ("a.nada. 4-2't 



lets. Floircrs dicEfious in erert tomentoso aiiioiits. expandiiiK Ix'foiv llic leaves; staminate 

 amtMits about 1 in. long near the ends of tlie brancliji'ts : perianlli wanting stamens ."'.-I'J. 

 inserted on tiie bases of the scales, with distinct filaments and oblong introrse U-celled longi- 

 tudinally dehiscent anthers: i)istillate ameiits smaller, with perianth consisting of small 

 scales; ovary superior, 1-celled, with an elongated tlatteneed recurved style, stigmatic on 

 inner face: ()\ule solitary, laterally attached, ascending, l-'niit an elongated comi)ressed dry 

 drupe, solitary or I' or' :*. together, with tiiiii-walied nullel : sei'<\ tiatteened with oblong 

 blackish hiluni. fleshy nibumen. erect end)iyo ami flat cordate cotyledons. 



THE CORKWOOD. Genus LEITXERIA Cii.\pm.\x. 



The genus is cliaracieiized as aixive and contains a single species. It was named after 

 Dr. E. F. Leitner, a (Jcrnian natuialist who was killed in Florida during the Seminole war. 

 For ,v/Hc/c.v .sTc PI,. 7.^-7.?. 



WILLOW FAMILY. SALICACE^. 



Trees and shrubs with soft light wood, brittle twigs, bitter bark and of wide distribution, 

 chiefly of tin; noiihern lieniisphere. They are grouped in two genera, having the following 

 characters in common : 



Lcaroi deciduous, simple, alternate and with sti]iules (sometimes minute and cadueousi. 

 Floircrs dioM-ious, appearing in early spring befoi'e the leaves, in aments, from axillary buds, 

 a single small flower appearing in the axil of each scale of the anient, perianth wanting: 

 stamens 2-many, subtended by a disk and with intror.se 2-celled anthers longitudinally 

 dehiscent: i)istil with short style. 2-4-lobed stigma and 1-celled ovary having 2-4 parietal 

 placentae and numerous anatropous ovules. Fruit a 1-celled 2-4-valved ovoid capsule, bearing 

 numerous minute seeds surrounded by long silky white hairs and containing short radicle, 

 fiat cotyledons and no albumen. 



KEY TO THE GENERA. 



Scales of the aments entire : stamens 2-10 and buds with a single scale Salix. 



Scale of the aments in<ised ; stamens numerous and buds with several scales.... Populus. 



THE WILLOWS. Genus SALIX L. 



Trees and shrubs of IC.d or 170 species of wide distribution throughout the northern and 

 a few ill the southern heinispliere. They grow generally along the banks of streams and 

 in low moist soil from the .Vrctic regions to the troiiics. Numerous natural hybrids also 

 occur. About Tt) siiecies are found in North America and of these 21 are recognized as 

 trees of wlii( h !» or 10 species are found in the northeastern states. Besides these we have 

 two or three natualized arborescent species. 



Lcarcs commonly lanceolate but ranging from obovate to linear: petioles short, some- 

 times glandular at apex and more or less covering the bud : stii)ules oblique, .serrate, large and 

 persistent (espe<Mally so on young shoots) or small and deciduous: winter buds covered 

 with a single scale of two coats, the inner thin and membranous, Floircrs in aments with 

 entire or glandular dentate bracts and disk gland-like, minute and nectiferous ; stamens 2-12 

 (mostly 2) inserted at the base of the scale, with slender and mostly free filaments and 

 small oblong anthers: pistillate aments usually (>rect or spreading: ovary sessile or short 

 stipitate with short style, 2 short more or less recurved 2-cleft stigmas and containing 4-8 

 ovules on each of the 2 placentas. Fruit an acuminate capsule dehiscent by 2 recurved 

 valves: seeds minute, dark brown. 



The name is [hv niicieiit Latin name of the genus. 



KEY TO TIIE Sl'ECIES. 

 a Stamens '>-7. with filaments hairy at base: aments terminating leafy branchlets and with 

 light yellow caducous scales 

 b Petioles not glandular: leaves 



c Pale or whitish beneath. Iance(date to ovate-lanceolate 



With longer luMiohs mostly • •_. in. or more long S. aiiiyp;daloides. 



^Vith very short i)etioles mostly less than ' :.. in. lotig S. lon(;;ix)es. 



c' Green beneath, narrow-lanceolate, long-pointed: iietioles short... S. nigra. 

 V Petioles glandular: leaves tai)er-])ointed 



Lustrous dark green above, pale beneath. IJiirkish and finely senate. 



S. liicida. 

 I Mill dark i^ic.mi (not lustrous I above, pale bi'iieath. thinnish and more co.-irselv s.'rrate. 



S. fragilis. 

 a' Stamens usually 2. 



b Am( iits both terminal and axillary: leaves linear-lanceolate and remotely dent Icui.ite : 



filaments hairy at base : bracts yellow, caducous S. fluviatilis. 



b' .\ineiits terminal on lateral branchlets. 



