140 



LEGUMINOS^. [Phaca, 



12. ROBINIA. De Cand. 



Calycis denies 5 lanceolati, 2 sup. breviores approximati. Cor, papilionacea vexiUo 

 amplo, carina obtusa, Stam. diadelpha decldua; ovarium 1 6-20-ovulatum. Stylus antice 

 barbatus. Legumen compressum subsessile polj'spermum, valvis planis tenuibus, sutura 

 seminifera marginata. — Arbores Boreali-Americanw, spinis stipularibus scepe cbnatm. 

 Folia impari-pinnata, foliolis petiolulatis basi stipellatis, Flores albi aut rosei, in racejnos 

 axillares scepius nutantes dispositi, DC. 



I. R, Pseudacacia; spinis stipularibus, ramis virgatis, racemis laxis pendulis legu- 

 minibusque glabris, foliolis ovatis. DC — Linn. Sp. PL p. 1043. Lam. III. t 606. f. I. 

 Mich. Arb, (ed. Am.) v. 2. t 76, Am. v. 2. p. 65. Pursk^ FL Am. v. 2. p. 487. Elliott, 

 Carol V. 2. p. 242. De Cand. Prodr. v. 2. p. 261. Bigel. FL Bost. ed. 2. p. 277. 



Hab. Canada. Michaux ; Pursh. Plentiful in Upper Canada. Douglas. — This, the False Acacia or 

 Locust-tree, in the rich soils, and with the g"enial summers of North America, produces a durable and 

 valuable timber : but it is little suited to the soil and climate of Great Britain. 



13. PHACA. Linn. 



F 



Calyx 5-dentatus, dentibus 2 superioribus remotioribus. Carina obtusa. Stamina 

 diadelpha. Stylus imberbis. Stigma capitatum. Legumen subturgidum uniloculare, 

 sutura superiore seminifera tumida. — Herbae /bliis impari-pinnatis, racemis pedunculatis 

 axillarihus, Legumina matura sapius resupinata. 



* Floribus albidis aut ochroleucis. 



1. P. frigida; erecta, glabriuscula, parum ramosa, foliolis 4-5-jugis oblongo-ovatis 

 subtus margineque pilosis, stipulis ovato-oblongis ciliads foliaceis magnis, calycis ore 

 pubescenti, leguminibus stipitatis oblongis inilatis membranaceis. — «. europcsa ; legumird- 

 bus hirsutis. Linn. Syst Nat. ed. 10. p. 1173. JF7. Lapp. ed. 2. p. 227. Jacq. Austr. t. 

 166. De Cand. Prodr. v. 2. p, 273.— P. alpina. Linn. Sp. PL p. 1064. Ft. Dan. t. 865.— 

 /3. Americana; leguminibus glabris. — P. frigida. Rich, in Frankl. \st Journ. ed, 2. App, p, 

 28. — y. littoralis ; calycibus leguminibusque nigro-hirsutis, caule humiliore, foliolis sub- 

 tus pubescenti-incanis. 



Hab. /3. Woody regions of the Rocky Mountains in lat. 52^ to 5Q°, to Slave Lake in lat. GI°. Dr, 

 jRichardson and Drummond. — y, Arctic shores, westward of the Mackenzie River, Copt. Sir John Franklin 

 and Capt. Bach, to Cape Lisburne, in Behring's Straits. Messrs. Lay and Collie in Capt, Seechey^s Col- 

 lection. — This plant, as found in the woody regions of North America, is equal in size with the Europaean, 

 and diiFers only in its glabrouS legumina. In the littoral Arctic regions it becomes much smaller, hoary, and 

 very pale beneath, and with the whole calyx, as well as the seed-vessels, clothed with black hairs. 



2. P. elongata ; caule erecto angulato pubescente parce ramoso, foliolis 8-10-jugis ob- 

 longo-cuneatis retusis subtus incanis, stipulis parvis e lata basi acuminatis inferioribus 

 coalitis, pedunculis folio multo longioribus, racemis elongatis laxis, calycibus sericeis, 

 leguminibus coriaceis cylindraceis curvatis sessilibus acutis. — ^. minor ; caule flexuoso. 



Radix perennis. Caules plurimi, pedales, vel sesquipe dales, erecti, stricti, in ^. flexuosi, angulati, incano- 

 pubescentes parce ramosl. Folia remota, digitalia; foliolis 8-10-jugis cum impari oppositis alternisve vix unciam 

 longis oblongis, basi cuneatis brevissime petiolulatis, apice obtusis vel plerumque retusis, supra glabris, subtus 



