198 



ROSACEA. [Rosa 



2. S. Canadensis; spicis longis cylindricis (albis), staminibus longe exsertis, filamentis 

 supeme dilatatis, foliolis ovato-oblongis subcordatis grosse serratis. — Ijimi. Sp. PL p, 169. 

 Mich. Am, v. 1. p. 100. Pursh, Fl. Am. v. 1. p. 126. Elliott^ Carol v, 1. p. 206. Torrey^ 

 Fl. of Un. St. v.l. p. 176. Bif/eL FL Bost ed. 2. p. 62. De Cand. Prodr, i\ 2. p. 594.— 

 jS. latifolia; foliolis brevioribus latioribus. 



Hab, Canada, about Quebec. MichanXy Mrs. Skeppard, Mrs. Percival. Newfoundland. Dr, Morrison. 

 /3. Observatory Inlet, North-West coast of America. Dr. Scouler. Grassy pastures in the vallies of Una- 

 iaschlia. Chamisso. 



20. POTERIUM. Linn. 



Flares monoici aut polygami, CaL basi 3-squamosus, tubo apice coarctato, limbo 4- 

 partito. Pet 0. Stam. 20-30. Ovaria 2 stylo filiformi et stigmate penicllliformi superata. 

 Achenia intra calycem indui'atum sicca 1-sperma. Semen inversum, — Herbse aut suffrutices. 

 Folia impari-pinnataj foliolis serratis {vel prqfunde divisis.) Flores in spicas glbbosas 

 cylindraceasve dense aggregati. DC. 



1. P. Sanguisorha; berbaceunij caule anguloso foliisque glabris, foliolis 4-5-jugis ovatis 

 subrotimdisve profunde serratis, capitulis subrotundis floribus inferioribus masculis. — Linn. 

 Sp. PL p. 1411. EngL Bot. L 860. De Cand. Prodr. v. 2. p. 594, 



Hab. Lake Hxu*on. Dr. Todd, (in Herb, nostr.) 



2. P. annuum ; hei'baceum annuum glabruni, caule erecto dichotomo, foliolis 4-5-jugis 

 ovatis profunde pectinato-pinnatifidis, laciniis lineari-angustissimis, capitulis ovalibus (uni- 

 sexualibus?) — Nuttaiiy MSS. in Herb, nostr. 



Radix parvas, annua. Caulis erectua, strictus, gracilis, pedalis ad bipedalem glaber, plerumque dicho- 

 tome ramosus. Folia plurima, glabra. Foliola 4-5-juga, circumscriptione ovata, ad costam usque pectinato- 

 pinnatifida, laciniis augustlssimis linearibus. Capitula terminalia, elliptica, ut videtur fiavescenti-piuYurea, 

 unisexualia ? 



IL\B. Rocks near the " Grand Rapids," on the plains of the Multnoraak, frequent. Douglas. — The 

 same very distinct species I have received from Mr. NuttaU (who gathered it upon the Red River, in Louis- 

 iana) as the P. annuum of his MSS. : a name, therefore, which I gladly adopt. 



Trib. V. RosE^. DC. 



21. ROSA. Tmtm. 



Calycis tubus apice contractus, limbo S-partito, lobis per sestivationem apice subspiraliter 

 imbricatis ssepe pinnatim sectis. Pet. 5. Stam. 00. Carpella plurima, calycis tubo 

 demum baccato inserta, et in eo inclusa, sicca indehiscentia subcrustacea, e latere interiore 

 stylum gerentia, stylis e calycis tubo coarctato exsertis, nunc omnino liberis, nunc in stylum 

 columnarem accretis. Semen in achenio solitariiun exalbuminosum, inversiun. Embryo 

 rectus, cotyledonibus planiusculis. — Frutices aut Arbusculse ; foliis scepius impari-pinnatis^ 

 foliolis serratis^ stipuUs petiolo adnatis. DC. 



Div. L CiNNAMOME^. Setigerce vel inermes bracteatm. Foliola lanceolata eglandulosa. 



Discus tenuis nequaquam incrassatus. Lindl. 



1. R. nitida; pumila, armis confertissimis gracilibus, foliolis nitidis anguste lanceolatis 



