longius, coriaceum, mono-aut oligospermum vix dehiseens, forma varium.1—Herbae
stipules petiolo adnata. Folia - pinnatim 3-foliolata, foliolis sespe dentatis. Flores laxe
racemosi,, flam aut rarius albi. DC.
1. M. officinalis; leguminibus dispermis ovatis rugosis, racemis laKis,‘corollis calyce
plusquam'duplo'longioribiisppetalis subasqualibus,'caule erecto. Willd^—De Cand. Prodr.
v. 2. p . 186. "Purshy FI Am. v. 2. p. 477. Elliott, Carol v. 2. p. ’ 199.—Trifolium
officinale. Linn.—Engl. Bot. t. 134-0.
Hab. About Montreal and Quebec. Lady Dalhousie; Mrs. Percival.—Naturalized.
5. TRIFOLIUM. | Hhn.
Cal. tubulosns persistens eglandulosus 5-fidus, laciniis subulatis. Carina alis et vexillo
brevier. Stamina, diadelpha. Legumen parvum vix dehiseens saepius ovatum 1-2-
spermum calyces brevius et ab eo tectum, rarius oblongum 3-4-spermum calycem
paululuimsuperans:—LHerbse. Stipulae petiolo adnata. Folia palmatim tri-aut rarissime
h-foliolata. ■' Flores capitati ■ out dense spicati, bracteacti, pwrpurei, albi aut ochroleud.
Petala' in quibusdam omnia inter se basi coalita. DC.
Sect. I. L agopus. Ser.
1. T. altissimum; glaberrimum, caule.,er.ec.to. elato, fobohs^Iinearirlanceolatis denticu-
latis petiolo longissimo, supremis subsessilibus, stipulis lanceolato-acuminatis petiolo
utrinque adnatis', capitulo oblongo, calycibus glaberrimis, dentibus 4 superioribus
tortuosis. (Tab. X L VIII.)—Douglas, MSS. in Herb. Hort. Soc.
Caulis erectus, strictus, 2-3-pedalis, herbaceus, striatus, glaber, superne parce ramosus. Folia trifoliolata,
glabra, caulina radicaliaque longissime. petiolata; suprema subsessilia, omnia lineari-lanceolata, apiculata,
subtilissime oblique striata, minute denticulata, pallide viridia, rigida. Stipules magnse, foliacete, striate
longissimse, lineari-lanceolate, acuminate, apice integra vel denticulate, petiolo utrinque per totam fere longi-
tudinem adnatse, cauli appressse, margine anteriore libera. Pedunculi subterminales, digitem et ultra longi,
glabri. - J‘65apiftrfa ovalia, multiflora, ebracteata; Flores majusculi, rubri, inferiores reflexi. - Calyces dense
dispositVglaberrimi, striati, membranacei. Tubus campanulatus, subinflatus, dentibus 4 superioribus tequali-
bus tubi longitudine, insigniter circa tubum corollse, (utrinque duobus) subspiraliter incuryis et quasi
tortuosis, dente inferiore reliquis longiore tubum corollse sequante, recto. Corolla calyce duplo longior;
petalis staminibusque in tubum simplicem basi inflatum unitis. Germen ovatum, compressum, beviter marginatum,
glabrum, monospermum. Stylus longus, filiformis, glaber. Stigma obtusum.
Hab. Abundant in North-West America, between the Spokan Fiver and Settle Falls of the Columbia.
Fl. June—August. Douglas:.—The somewhat spiked heads of flowers, and the great affinity in habit of this
plant with the following,-have induced me to place it in the family of “ Lagopus” although it departs from
it in the entirely glabrous calyces. The structure of this calyx is very remarkable: the lower .tooth or
segment alone is straight, the four upper ones, two on each side the corolla, bend downwards and inwards in
a sort of spiral manner, so as to surround the tube of the latter, their points meeting on the opposite side.
At first,-these teeth appear to be unnaturally twisted and distorted; but when they are examined with care,
the mode and direction of the curvature are found to be invariably, the same.
Tab. XLVIII. Fig. 1, Flower-; fig. 2, Calyx laid open, and seen from within; fig. 3, Front view-of the
Corolla; fig. 4, Pistil:—magnified.
2. T. plumosum; sericeo-pubescens, caule-elato erecto, foliolis lineari-lanceolatis
acuminatis denticulatis petiolof longissiffio1 supremis -sessilibus, stipulis lineari-lanceolatis
acuminatis petiolo adnatis, capitulis conico-oblongis, calycibus -hirsutissimis, dentibus
linearibus reetds tubo: corollse longioribus sericeo-plumosis, germine-4-ovulato. (Tab.
XLYK.)—Douglas, MSS. in Herb. Hort. Soc.
' Caulis erectus, strictus; herbaceus, striatus, sesquipedalis ad .bipedalem altus, superne subramosus,
subsericeo-hirsutus, pilis ercctis, parce foliosus. Folia caulina longissime pedunculata, suprema sessilia,
trifoliolata, foliolis lineari-lanceolatis, acuminatis, subrigidis, appresso-sericeis, denticulatis, minute oblique
striatis, acutissimis, subpungentibus. Petioli 6—8-pollicares. Stipules magnse, petiolo utrinque adnate,
margine anteriore libera, foliacese, lineari-lanceolate, acuminate, subdenticulate; superiores latiores,
breviores, inferiores angustiores, nonnunquam 3 uncias longse, magis acuminate. Pedunculi terminates,
dense sericei. Capitula 3-pollicaria, com pacta, conico-oblonga, multiflora, ebracteata. Flores albi, primum
erecti, dein, inferiores pracipue, subpatentes, semper arete dispositi. Calyx dense sericeo-hirsutus. Tubus
campanulatus: Dentes lineares, elongati, tubo longiores; 2 superiores subbreviores, omnes recti, pulcherrime
sericeo-plumosi. Vexillum superne latum, acutum. Petala filamentaque in tubum subaequale unita.
Pistillum: Germen ovatum, 4-ovulatum. .Stylus filiformis alarum longitudine.
Hab. Blue Mountains in North- West America, in alluvial soils. Fl. June, July. Douglas.—In height,
and foliage, and general habit, -similar to the preceding, but everywhere clothed with silky hairs, which
are most abundant on the upper leaves, peduncles, and especially on the calyces. Both ought to rank
near to T. rubens and angustifolium of the continent of Europe, from which they'are distinguished by the
characters above given.
Tab. XLIX. Fig. 1, Flower; fig. 2, Corolla; fig. 3, Pistil:—magnified.
• 3. T. .arvense; aimuum, caule erecto valde ramoso, foliolis spathulato-laiifceolatis
obtusis, stipulis ovatis-.loBge acuminatis pilosis, capitulis cylindraceis -villosissimis,
calycis dentibus setaceis persistentibus corolla - longioribus demum patentibus.^r-rZftww.
Sp. PI. p.' 1083. Engl. Bot. t. 944. Mich. Am. v. 2. p. 59. Elliott, Carol, v. 2. p. 203.
Pursh, Fl. Am. v. 2. p. 478. De Cand. Prodr. v. 2. p. 190. Bitjel. Fl. Bost. ed. 2’. p. 270.
Hab. Canada. Pursh; Mrs. Percival; Mrs. Sheppard.
Sect. II. E utriphyllum. Ser.
4. T. pratense; caulibus adscendentibus, foliolis ovalibus obcordatisve, stipulis ovatis
membranaceis nervosis seta terminatis, capitulis ovatis densis subsessilibus, dentibus
calycinis setaceis, inferiore reliquis longiore corollae tubo dimidio breviore.—Linn. Sp.
PI. p. 1082. Pursh, Fl. Am. v. 2. p. 478. Engl. Bot. t. 1770. Elliott, Carol, v. 2. p . 202.
Bigel. Fl. Bost. ed. 2. p. 271.
Hab. Canada. Pursh; Mr. Cleghom. Lake Huron, Dr. Todd; and as far north as the Saskatchawan.
Dr. Richardson; Drummond. North-West America, on the Columbia. Dr. Scouler; Douglas.
5. T. Pensylvanicum ;■ caule ramosissimo flexuoso, - foliolis ovato-ellipticis obtusis
integerrimis, stipulis‘afistatis, capitulis ovato-cylindraceis solitariis densis, calycis lacinia
infima petalis breviorel DC.—Willd. Enum. p. 793. Pursh, Fl. Am. v: 2. p. 478. De
Cand. Prodr. v. 2. p. 196.
Hab:' Plentiful in dry fertile soils,' about Sandwich and Amhertsberg, Upper Canada. Douglas.—With
this plant I am'unacquainted.- Pursh and De Candolle both observe that it is very nearly allied to T.
pratense. It is known in America by the name of Buffalo Clover.