12. ROBINIA. De Cand.
Calycis dentes 5 lanceolati, 2 sup. breviores approximati. Cor. papilionacea vexiUb
amplo, carina ob.tusa. Siam, diadelpha decidua; ovarium 16-20-ovulatum. Stylus antice
barbatus. Legumen compressum subsessile polyspermum, valvis planis tenuibus, sutura
seminifera marginata.—Arbores Boreali-Americance, spinis stipularibus scepe donates.
Folia impari-pinnata, foliolis petiolulatis basi stipeUatis. Flores albi aut rosei, in racemos
axillares seepius nutantes dispositi. DC.
1. R. Pseudacacia; spinis stipularibus, ramis virgatis, racemis laxis pendulis legu-
minibusque glabris, foliolis ovatis. DC.—Linn. Sp. PI. p. 1043. Lam. IB. t. 606. f . 1.
Mich. Arb. (ed. Am.) v. 2. t. *76, Am. v. 2. p . 65. Pursh, FI. Am. v. 2. p. 481’. Elliott.,
Carol, v. 2. p. 242. De Cand. Prodr. v. 2. p. 261. Bigel. FI. 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 genial 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.
Calyx 5-dentatus, dentibus 2 superioribus remotioribus. Carina obtusa. Stamina
diadelpha. Stylus imberbis. Stigma capitatum. Legumen subturgidum uniloculare,
sutura superiore seminifera tumida.—Herbse foliis impari-pinnatis, racemis pedunculatis
axiUaribus. Legumina matura seepius resupinata.
* Floribus albidis aut ochroleucis.
1. P. frig id a ; erecta, glabriuscula, parum ramosa, foliolis 4—5-jugis oblongo-ovatis
subtus margineque pilosis, stipulis ovato-oblongis ciliatis foliaceis magnis, calycis ore'
pubescenti, leguminibus stipitatis oblongis inflatis membranaceis.—x. europeea ; legumini-
bus hirsutis. Linn. Syst. Nat. ed. 10. p. 1173. FI. Lapp. ed. 2. p. 227. Jacq. Austr. t.
166. De Cand. Prodr. v. 2. p. 273.—P. alpina. Linn. Sp. PI. p. 1064. FI. Dan. t. 865.—
/3. Americana; leguminibus glabris.—P. frigida. Rich, in Frankl. 1st Joum. 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 56°, to Slave Lake in lat. 61°. Dr.
Richardson and Drummond.—y. Arctic shores, westward of the Mackenzie River. Capt. Sir John Franklin
and Capt. Back, to Cape Lisburne, in Behring’s Straits. Messrs. Lay and Collie in Capt. Beechey’s Collection.—
This plant, as found in the woody regions of North America, is equal in size with the Europaean,
and differs 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.—p. minor ; caule flexuoso.
Radix perennis. Caules plurimi, pedales, vel sesquipedales, crecti, stricti, in Q>. flexuosi, angulati, incano-
pubescentes parce ramosi. 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
pubescenti-incanis, in junioribus sericeis. Stipula parvæ, inferiores subeuneatæ, superiores liberæ, duas uncias
longæ, e lata basi sensim acuminatæ, subsericeæ. Pedunculi axillares, solitarii, non raro spithamæi, folio
duplo triplove longiores, erecti, stricti. Flores in racemum elongatum laxe dispositi, patentes, demum deflexi.
Stipula hneam longæ, subulate, sericeæ, pedicelli perbreves. Calyx cylindraceo-campanulatus, sericeus, ore
obliquo, dentibus lato-subulatis brevibus. Flores parvi, albi vel ochroleuci, carina solummodo apice purpureo,
ut videtur, tincta. Stamina diadelpha. Germen lineare, sericeum, rectum, subsessile, stylo subulato sursum
curvato glabro duplo longius. Legumen unciale et ultra, sessile, coriaceo-cartilagineum, cylindraceum, sursum
curvatum, hirsutum, apice acutum, uniloculare, 8- 12-spermum, valvis intus spongioso-subhirsutis, suturis
angustis æqualibus, minime introflexis.
Hab. Plains of the Saskatchawan. Dr. Richardson ; Drummond.
3. P. flexmsa; caule decumbente flexuoso angulato parce ramoso, foliolis 6-9-jugis
lineari-oblongis obtusis supra glabris subtus appresso-pilosis, stipulis parvis e lata basi
acuminatis, inferioribus coalitis, pedunculis folio longioribus, racemis elongatis laxis,
calycibus subsericeis, leguminibus coriaceis cylindraceis rectis sessilibus acutis.-—
Astragalus flexuosus. Douglas, MSS. in Herb. Hort. Soc.
Hab. Abundant on elevated and dry fertile soils of the Red River and Assinaboin, lat. 50°. Douglas.—
The habit of this is very similar to the preceding, and I am doubtful if it ought not to be united with it.
But the leaves are smaller and narrower, the “flowers are purplish and very fragrant,” and the légumes are
not only smaller than in P. elongata, but straight. What Mr. Douglas has considered as a white-flowered
variety, I have referred to the latter species. The cell of the fruit is without a dissepiment, nor is there
any introflexion or thickening of the sutures on either side of it.
4. P.collina; erecta vel diffusa, pilosa, foliolis 9—11-jugis linearibus obtusis basi in
petiolulum brevem attenuatis, stipulis parvis oblongis acuminatis, pedunculis folio duplo
longioribus, racemis oblongis densis floribus retrofractis, calycibus tubulosis dense
hirsutis, leguminibus (immaturis) linearibus pubescentibus stipitatis deflexis.—Astragalus
collinus. Douglas, MSS. in Herb. Hort. Soc.
Coulis erectus vel déclinâtes, ramosus, pedalis et ultra, teres, striâtes, pubescenti-hirsutus. Folia remota,
digitalia, subsessilia, 19-23-foliolata; foliolis remotis, unciam longis, angusto-linearibus, obtusis vel retusis,
subtus præcipue pilis brevibus albis curvato-patentibus obsitis, basi in petiolulum brevem attenuatis. Stipula
parvæ, oblongæ, acuminate, subfoliaceæ. Pedunculi foliis subduplo longiores, pubescentes. Racemi 3-4
uncias longi, oblongi. Flores arete dispositi, retrofracti. Bractea subulate, pedicellis erectis paululum
longiores. Calyx oblongus, dense hirsutus, pilis pallidis, tubo elongate basi obtuso subgibboso, dentibus
subulatis tubo tnplo brevioribus. Corolla alba, macula magna ut videtur singulo petalo purpurea. Vexilium
obovatum apice reflexum, alis carinaque longitudine subæquale. Stamina diadelpha. Germen lineare,
stipitatum. Legumen (vix maturum) calyce plusquam duplo longius, lineare, compressum? submembranaceum’
pubescens, uniloculare, basi in stipitem gracilem calycis longitudine, apicem stylo gracili sursum curvato ter-
minatum, polyspermum.
Hab. On the subalpine range of the Blue Mountains, in dry soils. Fl. June, July, If.. Douglas._This
plant, which, on an inspection of its legumen, must be referred to the genus Phaca, rather than to Astragalus,
where Mr. Douglas had placed it, is remarkable for its narrow linear leaves, for the sudden deflexion
of the flower from the summit of the erect pedicel, for the elongated tube of the calyx, and for the short
vexillum.
5. P.pectinata ; glabriuscula, caule decumbente striato, foliis pectinatis rigidis, foliolis
8-10-jugis linearibus subacutis terminali nonnunquam bifido, stipulis hinc longitudinaliter
unitis, racemis folio plerumque longioribus, leguminibus sessilibus ovalibus coriaceis