Io BOTANICAL GAZETTE [JANUARY 
exceptis) basi sensim in petiolum attenuata, ab infra medium ad 
apicem sensim acuminata, apice satis longe caudata, saepe falcata, 
7:0.3 vel 8:0.6 ad 12:0.7 vel 15:1.2 cm. magna, inferiora saepe 
lineari-elliptica, utrinque obtusiora vel obtusa, ramulorum fertilium 
(pedunculorum) variabilia, saepe elliptico-linearia vel anguste 
elliptica, utrinque acuta vel obtusiora, 2:0.3 ad 6-7:0.7-0.9 cm. 
magna, superne tantum valde initio sparse puberula et citissime 
glabrescentia, vivide viridia, ut in Humboldtiana reticulata et 
nervo intra-marginali percursa, subtus concoloria, initio ut superne 
vel saepe paullo magis pilosa, dein glaberrima, eodem modo reti- 
culata, margine satis dense aequaliter glanduloso-serrato-denticu- 
lata vel in foliis inferioribus ramulorum fertilium indistinctius 
dentata vel interdum subintegerrima. Petioli quam in S. nigra 
pl. m. longiores, latitudinem maximam laminae plerique super- 
antes, 2-10 mm. longi. Stipulae satis rariter distincte evolutae, iis 
formae typicae similes sed intus in facie pl. m. glanduliferae, vix 
ultra 8 mm. longae. Amenta fere ut in forma typica sed saepissime 
magis laxiflora, mascula ad 7:0.8 cm. magna; stamina 3-7, 
filamentis ad medium vel paullo ultra dense villosis; bracteae 
ovatae vel ovato-oblongae, pl. m. acutae, rarius obtusae, utrinque 
villosulae vel extus ultra medium ad apicem glabrescentes; glandu- 
lae 2, dorsalis pl. m. 3-partita (digitata); amenta feminea fructi- 
fera 4-7:1.3 cm. magna (pedunculis. foliatis interdum ad 4 cm. 
longis exclusis), pl. m. laxiflora; bracteae ovato-oblongae, pl. m. 
acutae, interdum ad apicem parce denticulatae, ut in floribus 
masculis villosae; ovaria stigmataque ut in S. nigra typica; glan- 
dula 1, ventralis, pl. m. ovata-rectangularis, apice truncata, 
pedicello juvenili duplo brevior; fructus maturi (5—)6-7 mm. 
mostly of a different shape, and often more resemble those of the fertile branchlets 
and (3) those of the fertile branchlets, that is, of the peduncles or the branchlets termi- 
nated by the catkins. It seems to me very helpful to keep apart those 3 different kinds 
of leaves, of which as a rule only one or two are represented in a specimen. Therefore, 
every collector of willows should try to get, at different times of the year, if possible 
from the same plant and of both sexes, the following parts: (1) branchlets with young 
flowers; (2) branchlets with ripe fruits collected when the first capsules begin to open; 
(3) mature leaves collected toward the end of the season (end of August to end of 
September, except in subtropical climates); (4) parts of offshoots with mature and 
young leaves; (5) leafless branchlets in winter with good buds, and pieces of bark. 
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