60 CRUCIFER^. (MUSTARD FAMILY.) 



32. ALTSSUM, 2i Pods obovate, orbicular, elliptical, or lenticular, flattened. Flowers 



yellow, or yellowish-white. 



33. DRABA. J^ Pods lenticular, or elliptical. Petals entire, or notched, yellow, or white 



34. EROPHILA. 2f Pods elliptical to oblong. Petals 2-lobed or -parted, white. 



Tribe Y. CAMELiINE^. Pods oblong-linear, ovate, obovate, elliptical or orbicHlar, 

 Seeds in 2 rows, rarely in 1. Cotyledons incumbent. 



35. LEPTALEUM. Pods linear. Dwarf, .05 to .1. Glabrous plants. 



36. CAMELINA, Pods ovate, obovate, orbicular, or linear. Tall, .3 to .5. 



36 (a). CHETSOCHAMELA. Pods elliptical or ovate. Low, canescent herbs. 



SERIES B. Valves flattened contrary to septum. 



Tribe YL l.EPIDINEiE. Pods ovate, obovate, obcordate, orbicular, or elliptical ■ 

 valvei boat-shaped. Cotyledons incumbent, conduplicate, or convolute. 



37. CAPSELLA. Pods obcordate or ovate, wingless j seeds numerous. 



38. LEPIDIFM, 2^ @ Pods ovate, elliptical, or orbicular, wingless, rarely winged. 



Stamens 4 or 2. Flowers minute, white or yellow. 



40. .(ETIIIONEMA. If Pods obcordate, obovate, orbicular, or ovate, winged. Flowers 



pink, purple, or rarely white. 



Tribe YII. THIiASPIDEiE. Pods composed of twin, orbicular cells, or oblong, 

 elliptical, orate, obovate, obcordate, or obtriangular. Cotyledons accumbent. 



41. BISCUTELLA. Pods composed of twin, orbicular cells. 



42. HELDEEICHIA, ^t Pods transversely ovate, almost twin, truncate, broader than 



long. Alpine plants with white flowers. 



43. THLASPI. @ Pods obcordate-orbicular, obtriangular, or oblong. Flowers racemed , 



sometimes irregular, 



44. CARPOCERAS. @ Pods obtriangular, or oblong, 2-horned. 



45. IBEEIS. (D Pods ovate, obcordate, or obovate-horned. Flowers in umbels, irregular. 



46. TEESDALIA. Pods obovate, keeled, winged. Flowers racemed, minute, white. 



47. HUTCHINSIA, Pods elliptical, wingless. Flowers racemed, minute, white. 



ScBORDEK III. NUCAMENTACEJE. Pods indehiscent, twin or single nutlets, 

 wingless or winged. 



Tribb VIII. SENKBIERIE-iE, Pods twin, 1-celled nutlets. Cotyledons narrow, 

 incumbent, 2-plicate. 



48. SEKEBIEEA. (D Pods broader than long, (ours) rough-tubercled. 



Tribe IX. ISATIDEJE. Pods single nutlets, winged or wingless, I-celled witli 

 1-2 seeds, or 2-4-celled with 1 seed in each cell. 



♦ Fods winged. 



t Cotyledons accumbent. Pods orbicular or obovate to elliptical. 



49. PELTAEIA. 2f Pods large, .01. Stamens not appendaged. Tall, glabrous herbs. 



50. CLYPEOLA. Pods small, .004 or less. Low, canescent herbs. 



t t Cotyledons incumbent. Pods ovate, oblong, or linear. 

 SAMERARIA. Pods coriaceous. "Wing orbicular, membranous, (p. 4 Addenda). 



51. ISATIS. 2f Pods bony or horny, with leathery or papery wings, 



t t t Cotyledons wrinkled lengthwise. Pods ovate. 

 5Q. BOREAVA. Pods 4-wlnged. Plants with habit of Bunias. 

 * * Pods uingless (except Bunias). 

 t Cotyledons incumbent, fiat, or transversely wrinkled. 

 53. NESLIA. © Pods small, .09, oblate-spheroldal, flattened ; style awl-shaped. 



