212 JOURNAL OF THE ARNOLD ARBORETUM [vol. i 



of these species probably will elucidate more distinctly the true relationship 

 between them. Of S. laurenfiana the male plant is not yet known. The 



color of the anthers of all the species seems to be yellow with the possible 



exception of S. alaxensis of which the young anthers may be violet. The 

 fihiments are gh^brous and free, sometimes, however, sHghtly piU)se at their 

 base and somewhat united. I cannot yet state whether there are some 

 forms which always show a few hairs at tlie base of the fihiments. 



The mahi diflfercnce of the species with which I am here deaUng can be 

 taken from the keys. As to the synonymy of the section the following is 



to be said. 



Section ChrysanthcaeY.OQh, Salic. Europ, Com. 11 (1828). — Sect, f/^ry.^- 



anthoH Frkvs, Novit. Fl. Suec. Mant. i. 37 (Com. Salic.) (1882). — Sect. 

 Cinereac IJarratt apud Hooker. Fl. Bor,-Am. ii. 144 (1838), pro parte.— 

 Sect. Discolores Harratt, 1. c. 147 (1838), pro parte. ^ Sect. Ardicae vcl 

 Suharcticae Andersson in Ofv. Svensk. Vet.-Akad. Fiirh. xv. 119 (1858). 

 pro parte maxima. — Sect. Mveae s. Glaucae [subscct.] A. Lanaiae And(T- 

 sson in De Candolle, Prodr. xvi.^ 275 (1868), pro parte. — Sect, Lanatae 

 Kcihne, Deutsche Dendr. 94 (1893)- Ball apud Coulter & Nelson, New 

 Man. Rocky Mts. Bot. 135 (1909). — Sect. Lanafae, subsect. Chrysanthcae 

 Schneider, 111. Handb. Laubh. i. 47 (1904). — Sect. Argentca Rydberg, Fl. 

 Rocky Mts. 189 (1917), pro parte. 



CLAVIS SPECIERUM VARIETATIMQUE 

 A. Secundum Specimina Feminea 



Ovaria et pcdiccUi glahri. 



Amenta etiam fructifcra sessiha; pedicelli uulli, subiuilli vol in S. Barraiimna var. 



Ticccdfji ad 1 nun. longi; styli 1.5 ad 2.5 nun. longi; ramuli novclli dcnsr lur- 



suto-villosi v(^l lanuginosi; stipulae distinetae, persistcntes. 



Stipulae lineari- ad semicordato-lancoolatae, aplce plus minusvc acuminatae, 



ad 1-2.5 cm. loiigae, in surculis sacpe latiores ct lubulatac, margiue glaud- 



uI<)So-serrato-d<M.tatae ^^ ^- RichardsonH. 



Stipulae semicordatae ad semiorbiculares vel reniformcs, margme dense 



glanduliftTai*. 

 Petioli hrevlssiml, vix ultra 4 mm. longi; folia inajora superiora late ovata 

 ad orbicularia, basi pleraciue cordata, apice ohtusa vel leyiter acutaia, 

 niar^hic fere semper lutegtTrima; amenta frnetifera ad (>-8.5: 1.2 1.8 em. 

 magna; fruetus ad 6 nun. longi, ovuideo- vel ellii)tieo-coniei, subrostrati. 



2. S. calcirola. 



Teiioli 8-15 nun. longi; folia majora snperiora elliptiea vel ovalia. basi aeuta 

 ad subobtusa, margine pins minnsve glanduloso-snbspinnloso-dentienlala. 



3. S. Barrattiana var. Twcediji. 

 Amenta pedunenlo distineto foHolato siiffulta, vel bn-viter peduneulata (saltem 

 frnetifera) et pedicelli 1-2 nun. et styli vix ultra 1.3 nun. lungi; stipulae nuUae 

 vel etiam hi ramulis vegeti<»ribus i)arvae, eaducae. 

 Ramuli novelli liornotiniqne plus minnsve dense tomentosi. 



Styli '1-^.5 nun. longi; anu^ita distincte peduneulata (pednneulo ^^-4-fuliolato 



ad 1.5 vel interdum ad ^2 cm. longo) 4. S. amplifolia. 



Styli 1-1.3 mm. longi; amenta subsessilia, pedunculo ad 5 mm. longo foliola 

 3-5 parva gerente suffulta. 



