402 PROCEEDINGS OF THE AMERICAN ACADEMY 



469. Betula pumila L. ; Regel in DC. Prodr. 16, p. 173. 



470. Alnus rubra Bongard ; Regel. 1. c. p. 186. 



471. Salix lanceolata Anders. Sal. Monogr. & in DC. Prodr. 

 16, p. 206, ex char. With mature fruit. 



472. Salix longifolia Muhl. ; Anders. 1. c. var. 



473. Salix Sitchensis Bongard ; Anders. 1. c. With ripe cat- 

 kins only an inch or two long. 



(Salix chlorophylla var. pellita Anders, in DC. 1. c. p. 243. 

 One or two specimens collected, in fruit.) 



474. Salix sessilifolia Nutt., var. villosa Anders, in DC. 1. c. 

 p. 215? 



475. Pinus contorta Dougl. ; the narrow-leaved, true Douglasian 

 species. 475 a . A mountain form with broader leaves. 



476. Pinus ponderosa Dough, the original Douglasian form, ac- 

 cording to Dr. Engelmann, with ripe cones. 



477. Pinus monticola Dougl. : foliage and old cones. 



478. Pinus albicaulis Engelm. ; with male flowers only. Higher 

 elevations of Mount Hood. 



479. Abies grandis Dough, forma lasiocarpa Hook. (A. bi r 

 folia Murray,) from the upper part of Mount Hood. 



480. Abies (Tsuga) pattoniana Jeffrey, Gordon. A. William- 

 sonii Newberry. 



481. Abies (Tsuga) Douglasii Lindl. In fruit. 



482. Abies (Tsuga) Mertensiana Lindl. In fruit. 



483. Thuya gigantea Nutt. Sylv. 3, t. Ill ; Hook. Fl. Bor.-Am. 

 1, p. 165. 



484. Juniperus commuris L. var., alpina Pari, in DC. Prodr. 

 16, p. 480. 



485. Taxus brevifolia Nutt. Sylv. 3, p. 86, t. 108. The Coni- 

 ferce were mostly determined by Dr. Engelmann. 



486. Potamogeton natans L. ; Hook. Fl. Bor.-Am. 2, p. 171. 



487. Potamogeton Claytonii Tuckerman ; Robbins in Gray 

 Man. p. 485. 



488. Potamogeton rufescens Schrader ; Hook. Fl. Bor.-Am. 

 p. 172. 488\ A large form? 



489. Potamogeton perfoliatus L. ; Hook. 1. c 490. Var. 

 lanceolatus Robbins in Gray, Man. 1. c. 



491. Potamogeton compressus L. P. zostercefolius Schuma- 

 cher, Hook. 1. c. 



