122 BOTANY 
PEDICULARIS DENSIFLORA, Benth. in Hook. Fl. Bor. Amer. 2, p. 110, in DOC. l. c., p. 514. 
Napa Valley, California; April 5. In fruit. 
PEDICULARIS RON Benth. in DC. l. c. Mountains near Oakland, California; April 5. 
In flower. 
BIGNONIACEA—SESAMEZ. (By A. Gray.) 
MOHAVEA, Nov. Gen. 
Calyx alte 5-partitus, laciniis lanceolatis foliaceis fere æqualibus. Corolla hypogyna, pro- 
funde bilabiata personata, limbo amplo patenti tubo campanulato multo longiore; labio postico 
latissimo rotundo emarginato-bilobo, estivatione exteriore, basi fornice supra antheras arcuata 
instructo ; labio antico consimili subtrilobo, palato prominente medio barbato. Stamina fertilia 
2, tubo corolle inserta: filamenta apice incurva: anthere approximata rotundo-reniformes, 
confluentim uniloculares. Filamenta sterilia sepius 2, exigua. Stylus columnaris: stigma 
compresso-capitatum, integrum. Ovarium ovoideum, biloculare, placentis axilibus, apice tan- 
tum placentis haud coalitis uniloculare, parietibus membranaceis. Ovula multa, pluriseriata, 
horizontalia vel adscendens, anatropa. Fructus ignotus. Herba humilis, ramosa, diffusa, pilis 
viscidis et glanduliferis pubescens ; radice annua ; foliis alternis, imisve oppositis, oblongo seu 
ovato-lanceolatis, integerrimis vel repando-angulatis, penninerviis, basi angustata parallelin- 
erviis; floribus axillaribus solitariis, pedunculis nudis brevibus; corolla ochroleuca? et pur- 
purascente, fauce cum palato purpureo picta. | 
MOHAVEA VISCIDA. Mohave Creek, California; March 2. Leaves 11 to 2 inches long. Sepals 
half an inch long, exceeding the short tube of the corolla. Lips of the corolla nearly an inch | 
broad, apparently flat. Filaments and style somewhat hairy towards the base, included within 
the throat. Ovary 2-celled, except near the summit, with no dorsal introflexion of the walls, 
the placente not bilammelar. Style nearly as long as the stamens. Notwithstanding the ovary, 
which is strictly 2—celled, except at the top, we suspect this curious plant to belong to the Big- 
noniacew-—Sesamez ; but the fruit alone can determine the question. If the seeds prove to be 
albuminous, we know not where in the order Scrophulariacee to place it. In one of our few 
specimens a singular abnormal body was found growing from the outside of the corolla at its 
base, resembling a long-clawed petal, with a small, truncate, saccate, and involute limb. It is 
evidently a monstrosity. 
VERBENACEZ. 
VERBENA PROSTRATA, R. Br. in Hort. Kew. (ed. 2) 4, p. 41; Schauer in DC. Prodr. 11, p. 
547. Banks of the Mokelumne River, California, May 17. 
LABIATA. 
PYCNANTHEMUM CALIFORNICUM (Torr. in Durand, Pl. Pratt. in Jour. Acad. Phil. 2, p. 99): 
incano-pubescens, foliis ovato-lanceolatis sessilibus parce denticulatis; verticillastris 2-4 den- 
sissimis, demum scorpoideo-explanatis multiradiatis ; calycis dentibus squalibus lanceolatis 
muticis. California, probably from the lower part of the Sacramento Valley. Gathered by 
Colonel Frémont, (1846), Rev. A. Fitch, & Mr. Shelton. 
P. CALIFORNICUM, var. foliis tenuioribus oblongis glabriusculis viridibus. River banks and 
ravines, Mokelumne, California, (with the persistent inflorescence of the preceding year).— 
This plant is a genuine Pycnanthemum, and is most nearly related to P. muticum. No other 
species is found west of the Rocky Mountains. The inflorescence is at first in the form of com- 
pact heads, of which there are usually three on the main axis. Late in the season these unfold 
into very dense sessile cymes, the branches of which are secund, and nearly an inch in length, 
