BOTANY. 
67 
17. A humble annual; seldom more than a span high. The flowers are tetrapetalous in all of 
Dr. Bigelow’s specimens. 
Lepidium alyssoides, Gray, PI. Fendl. p. 10. San Antonita and Galisteo, New Mexico ; Oc¬ 
tober. 
Lepidium Wrightii, Gray, PI. Wright. 2, p. 15. On Williams’ River of the Colorado, New 
Mexico ; February 11. There are 4 minute petals in all the specimens. 
Lepidium flavum (sp. nov.): annuum, pusillum, acaule, demurn prolifero-ramosum, depressum 
glabrum ; foliis crassiusculis ohlongo-spathulatis pinnatifidis, lobis rotundatis brevibus ; floribus 
capitato-congestis flavis ; petalis obovatis unguiculatis ; siliculis ovatis, sinu lato emarginato 
truncatis breviter bidentatis stylo bis longioribus. Sandy places near the Mohave creek ; March 
13. These are early specimens of a minute depressed plant, in flower only. But a single 
specimen was gathered by Fremont, in the same region, in his second expedition, from which 
the fruit is here characterized. The leaves are half an inch or more in length, and mostly 
rosulate around the sessile capitate or umbellate cluster of small yellow flowers : and the axis of 
the inflorescence apparently does not elongate in fruit. Stamens tetradynamous. Silicle a line 
long. Valves minutely reticulated. Cotyledons incumbent. 
Thysanocarpus elegans, Fisch. & Mey. Ind. Sem. St. Peter sb., Dec. 1835 ; Torr. & Gray, FI. 
1. p. 118. Hill sides, Napa ; April. The pods are perforated only when they are quite mature 
and dry. They vary in shape from nearly orbicular to orbicular-obovate. The stem is usually 
simple or with very few branches. T. pulchellus, Fish. & Mey., and T. radians, Benth., seem 
to be only forms of this species. 
Thysanocarpus crenatus, Nutt, in Torr. & Gray, FI. 1. c. Hill sides, Sonora, California; May 
9. Chiefly distinguished from T. elegans by its smaller pods and paniculately branching stem. 
Thysanocarpus laciniatus, Nutt, in Torr. & Gray, FI. 1. c. Plains near San Gabriel, March 
23, and sandy places, Cajon creek. Radical leaves pinnatifid ; the segments very narrow and 
entire. 
Thysanocarpus oblongifolius, Nutt, in Torr. & Gray, FI. l,c. Sides of hills, Napa; April 26. 
Thysanocarpus pusillus, Nook. Ic. 1, t. 43; Torr. & Gray, FI. 1. c. Low wet places near 
San Francisco, April 8, and Murphy’s, May 14. 
CAPPARIDACEiE. 
Cleome (Peritoma) integrifolia, Torr. &. Gray, FI. 1, p. 122 ; Gray, Gen. III. t. 76, PI. 
Fendl. p. 11. Comanche plains, on the banks of rivulets ; September. The form with lanceo¬ 
late leaflets, and very densely crowded, large flowers. Galisteo, and on the Rio Grande near 
Santa Domingo, in low places ; October: a form with oblong or obovate leaflets, and smaller 
as well as fewer flowers, mostly on short axillary branclilets, appearing considerably different, 
but doubtless of the same species. Fendler’s No. 49 is intermediate. The leaflets are entire 
in all the specimens I have seen. Probably, however, C. serrulata, Pursh is not distinct. 
Cristatella Jamesii, Torr. & Gray, FI. 1, p. 124 ; Gray, Gen. III. t. 77. Gravelly hills, on 
the Canadian ; September. 
P olanisia uniglandulosa, DC. Prod. 1. p. 242; Gray, PI. Wright. 1 ,p. 10. P. trachysperma 
Torr. & Gray, FI. 1, p. 669. On the Canadian, and at Anton Chico ; August, September. 
VIOLACEiE. 
Viola Sheltonii, (sp. nov.): glabra, caulibus adscendentibus brevibus ; foliis circumscriptione 
reniformi-cordatis trisectis, segmentis subsessilibus, irregulariter palmatim 5-8-fidis lobatisve, 
lobis lineari-cuneatis obtusis; stipulis parvulis ovatis apice ciliatis, sepalis lineari-lanceolatis; 
petalis luteis, calcare brevi sacciforme, (Tab. II.) Hill sides, Yuba, near Downieville ; May 8. 
A neat little species resembling V. Beckwithii, Torr. & Gray in Beckwith's Report ; but that has 
the divisions of the leaves conspicuously petiolulate, and the two upper petals purple. 
