514. RHINANTHUS. Gen. pl. 997.

1. R. corollarum labio superiore emarginato bidentato, la- Crista galli. cinia media labii inferioris brevissima. Willd. sp. pl.3.

p. 188.

Icon. Schkuhr handb. 169. Fl. dan. 981. In fields and meadows: Lower Canada. v. v. Flowers yellow. R. virginicus. & Pedicularis pallida.

515. BARTSIA. Gen. pl. 996.

Engl. bot. 657.
. June, July.
Vid. Gerardia

1. B. foliis alternis linearibus indivisis, superioribus lanceo-
latis, floralibus subovalibus summitate subdentatis, om-
nibus 3-nervibus, dentibus calycis acutis.-Willd. sp.
pl. 3. p. 186. Mich. fl. amer. 2. p. 17.
Icon. Gmel. fl. sil. 3. t. 42.

In Canada and Labrador. On the White-hills of New Hampshire. Prof. Peck. 4. July. v. s. in Herb. Lambert. Flowers pale yellow; the floral leaves purple. 2. B. foliis alternis prælongo-linearibus, floralibus ovatis longissime acuminatis 3-nervibus, omnibus indivisis, floribus bracteis brevioribus, dentibus calycis acutis. On the north-west coast: Unalashka. 4. v. s. in Herb. Lambert.

3. B. hirsutissima; foliis alternis linearibus inciso-pinnatifidis: laciniis filiformibus, bracteis membranaceis oblongis obtusis basi utrinque hastato-unidentatis floribus. longioribus, calycibus brevibus pilosis, dentibus subulatis.

On the banks of Clarck's river. M. Lewis,

. July.

v. s. in Herb, Lewis. About a foot high; flowers deep yellow; floral leaves tinged with purple. 4. B. foliis alternis linearibus inciso-pinnatifidis, laciniis linearibus, bracteis dilatatis plerumque trifidis floribus longioribus, dentibus calycis rotundato-obtusis.— Willd: sp. pl. 3. p. 185.

Icon. Pluk. alm. t. 102. f. 5. Moris. hist. 3. s. 11. t. 13. f. 28.

a. B. bracteis coccineis.

6.B. bracteis lutescentibus. Rarior.

In wet meadows: Canada to Florida. . 4. June, July. v. v. Flowers yellow, involved in scarlet floral leaves, which give this plant a very elegant appearance.

pallida.

acuminata.

tenuifolia.

coccinea.

coccinea. pallens.

alpina.

5. B. foliis oppositis ovatis subcordatis obtuse-serratis rugo.
sis, antheris hirsutis.- Willd. sp. pl. 3. p. 187.
Icon. Fl. dan. 43. Engl. bot. 361. Schkuhr handb. 168.
In Labrador. Colmaster. 24. July. v. s. in Herb.
Dickson. Not above six inches high; floral leaves
similar to the stem leaves, purple; flowers long, of a
fine deep purple.

Gymnandra. 6. B. foliis suboppositis ovatis crenatis, binis radicalibus petiolatis, spica oblonga, verticillis bracteatis coarctatis. -Willd. sp. pl. 3. p. 186.

officinalis.

latifolia.

lineare.

Gymnandra borealis, Pall. itin. 3. t. A. f. 1.
Lagotis glauca. Gært. act. petrop. 14. t. 18.

On the mouth of the river Columbia. M. Lewis. In
Unalashka. Herb. Pallas. 4. v. s. in Herb. Lewis.
nec non Lambert. About a span high; flowers pale
blue. This singular plant grows on the most unfertile
rocks, exposed to the most rigorous cold winds, in
places where vegetation seems entirely to cease.

516. EUPHRASIA. Gen. pl. 998.

1. E. foliis ovatis obtuse-dentatis, laciniis labii corollæ inferioris emarginatis. Willd. sp. pl. 3. p. 193.

Icon. Fl. dan. 1037. Engl. bot. 1416. Sabb. hort. 3. t. 9.

In Canada. Michaux. o. July-Sept. v. s. Flowers white, with purple veins.

2. E. foliis ovatis dentato-palmatis, floribus spicatis, corol-
lis tubulosis, laciniis labii inferioris obtusis. Willd. sp.
pl. 3. p. 192.

Icon. Sabb. hort. 3. t. 7. Moris. hist. 3. s. 11. t. 24. f. 8.
In Labrador. Colmaster. O. July. v. s. in Herb.
Dickson. Flowers smaller, pale purple.

517. MELAMPYRUM. Gen. pl. 999.

1. M. gracile; foliis inferioribus linearibus integris, floralibus lanceolatis postice dentatis, floribus axillaribus distinctis. Lam. encycl. 4. p. 23.

M. americanum. Mich. fl. amer. 2. p. 16.

In shady woods, particularly on the mountains: Canada to Carolina. O. July, Aug. v. v. Flowers yellow.

518. OBOLARIA. Gen. pl. 1044.

1. O. caule simplici, foliis oblongis truncatis carnosis subtus purpureis, floribus axillaribus solitariis sessilibus.Willd sp. pl. 3. p. 346.

Icon. Pluk alm. t. 209. f. 6. Moris. hist. 3. s. 12. t.16. f. 23.

In shady rocky places: Pensylvania to Virginia; rare. Not above three inches high; flowers pale red, in a spike, supported by purple bracteas.

virginica.

1. O. caule ramoso, floribus alternis distantibus, corollis de.
ciduis 4-dentatis.—Willd. sp. pl. 3. p. 351.
Icon. Moris. hist. 3. s. 12. t. 16. f. 9.
Parasitic on the roots of beech-trees: Canada to Georgia.
2. July-Sept. v. v. Flowers small, purple. This
plant is known by the name of Cancer-root, being
thought to be a never-failing remedy in cancerous
ulcers.

2. O. caule simplicissimo squamis ovali-lanceolatis imbrica-
tis obtecto, spica terminali glabra, corollis recurvatis,
staminibus exertis.-Willd. sp. pl. 3. p. 351.
Parasitic on the roots of trees: Pensylvania to Carolina.
4. July. v. v. About a span high, of a brownish-
yellow colour.

3. O. scapis nudis unifloris, calyce ebracteato, corolla re-
curvata.-Willd. sp. pl. 3. p. 352.

Icon. Pluk. mant. t. 348. f. 3.

Parasitic on the roots of different plants and shrubs : Canada to Virginia. 4. June, July. v. v. Not above two or three inches high, of a tan colour; flowers pale purple.

virginiana.

americana.

uniflora.

XIV. TETRADYNAMIA.

I. SILICULOSA.

*Silicula integra.

520. DRABA. Silicula integra, ovali-oblonga, valvis planiusculis dissepimento parallelis.

521. MYAGRUM. Silicula suberosa, evalvis, loculis fertilibus atque spuriis, sibi mutuo superimpositis. Stylus persistens.

522. CAKILE. Silicula lanceolata, subtetragona, medio utrinque dente instructa, biarticulata, ad articulos secedens: articulis monospermis, evalvibus.

**Silicula apice emarginata.

523. ALYSSUM. Filamenta quædam introrsum denticulo notata. Silicula emarginata, plerumque pilosa. 524. CORONOPUS. Silicula reniformis, compressa, corrugata, loculis evalvibus monospermis.

525. LEPIDIUM. Silicula emarginata, cordata, polysperma: valvulis carinatis dissepimento contrariis.

526. THLASPI. Silicula emarginata, obcordata, polysperma valvulis navicularibus, marginato-carinatis.

II. SILIQUOSA.

*Calyx clausus, foliolis longitudinaliter conniventibus. 527. ERYSIMUM. Siliqua columnaris, tetraëdra. 528. CHEIRANTHUS. Silicula compressa. Stigma bilobum. Germen utrinque denticulo glandulato. 529. HESPERIS. Petala oblique flexa. Siliqua stricta. Stigma basi bifurca apice connivente. Glandula in

tra stamina breviora.

530. ARABIS. Siliquæ compressæ. Glandulæ nectari

feræ 4. singula intra calycis foliola, squamæ instar
reflexæ.

531. TURRITIS.

Siliqua longissima, angulata, striata.

Cal. connivens, erectus.

Petala erecta.

Glandula inter sta

532. BRASSICA. Cal. erectus, connivens. Dissepimentum prominens. Sem. globosa.

mina breviora et calycem. Siliqua teres, rostrata.

533. DENTARIA. Siliqua elastice dissiliens, valvulis revolutis. Dissepimentum subfungosum. Stigma emarginatum. Cal. connivens.

**Calyx hians, foliolis superne distantibus.

534. CARDAMINE. Siliqua elastice dissiliens, valvulis revolutis. Stigma integrum.

535. SISYMBRIUM. Siliqua rostro brevi tereti dehiscens, valvulis rectiusculis. Corolla patens.

536. CLEOME. Glandulæ nectariferæ 3. ad singulum sinum calycis singulæ, excepto infimo. Petala omnia adscendentia. Germen stipitatum. Siliqua 1-locularis, 2-valvis.

I. SILICULOSA.

520. DRABA. Gen. pl. 1076.

1. D. scapo nudo, foliis oblongis acutis subserratis hirtis, petalis bifidis, stigmate sessili.-Willd. sp. pl. 3. p. 426.

Icon. Fl. dan. 983. Engl. bot. 586.

In cultivated grounds and old fields: Canada to Virginia. O. March-May. v. v. All the species of this genus are small plants with white flowers.

2. D. scapo nudo, foliis ovalibus acutis hirsutissimis, siliculis longo-linearibus glabris approximatis.-Mich. fl. amer. 2. p. 28.

D. caroliniana. Walt. fl. car. 174.

In sandy fields: Virginia and Carolina, and on the banks of the Missouri. O. April-June. v. v.

3. D. scapo subunifolio adscendente, foliis lanceolatis integerrimis subtomentosis: pilis stellatis, petalis retusis. -Willd. sp. pl. 3. p. 427.

verna.

hispidula.

nivalis.