MUSTARD FAMILY 323 



Anthers not subsagittate at the base. 



Pod short, from orbicixlar to linear-oblong. 



39, Draba. 



Pod elongated-linear. 



Cotj'ledons accumbent. 40, Arabts. 



Cotyledons incumbent. 23. Conkingia. 



Anthers subsagittate at the base. 



Stigma 2-lobed; seeds margined: cotyledons strictly accum- 

 bent. 41. Parrya. 



Stigma entire, capitate; seeds marginless; cotyledons obliquely 



accumbent. 42. PiiAi^MCALLis. C 



2. Anthers sagittate at the base. 



Calyx urn-shaped, closed; blades of the petals narrow, imdulate-crisp. 

 Cotyledons accumbent; stem not succulent; flowers small. 



43. Cartiera. 

 Cotyledons incumbent; stem more or less succulent; flowers comparatively 

 large. 44. Caulanthus. 



Calyx carapanulate. open; petals ample. 



Pod flat; anthers neither curved nor twisted. 

 Stigma 2-lobed. 



Lobes of the stigma oyer the placentae; perennials. 



41. Parrya. 

 Lobes of the stigmas over the valves; annuals, 45. Streptaxtella. 

 Stigma entire, capitate; seeds marginless. 



Cotyledons obUquely accumbent ; low perennials, with pink or 



purplish flowers. 42. Ph^'enOcaults. 



Cotyledons incumbent; tall leafy plants, with greenish flowers. 



46. ChlorocrambE. 

 Pod terete or tetragonal; anthers curved or twisted (except in Schocno- 



crambe). 



Sepals unequal, the lower longer; hairs, at least some of them, stellate 

 • 1> or branched. 49. Heterothrix. 



Sepals equal or nearly so: hairs simple or none. 

 Sepals erect or ascending in anthesis. 



Stigma distinctly lobed, its lobes expanded over the septum. 

 Plants with creeping rootstocks. 47. Schoenocr.\mbe. * 



Plants with taproots. 48. Thelypodiopsis. 



Stigma entire or, if distinctly lobed. the lobes expanded over 



the valves. 

 Stigma conical; outer sepals gibbous at the base. 



50. Hksperidaxtiics. 

 Stigma truncate; sepals scarcely gibbous at the base. 

 Septum of the pod without a distinct midrib. 



51. THKhYPODlVM, 



Septum of the pod with a strong midrib. 



52. PLEtJROPHRAGMA. 



Sepals strongly spreading or reflexed in anthesis, soon deciduoiis. 



53. Stanutyella. 



II. Pod terete, long-stipitate; sepals spreading or reQexed in anthesis; anthers curved 



and spirally twisted. 54. Staxleya. 



1. ISATIS L. Woab. 



Annual to perennial herbs. Flowers perfect, racemose. Sepals equal, 

 ascending-spreading, not gibbous at the base. Petals 3'ellow, entire, equal. 

 Stamens 6; filaments not dilated, on a disk. Pod indehiscent, 1 -celled, l-(rarelv 

 2-) seeded, oval to oblong, flattened contrary to the partition^ ^vinged all around, 

 without style. Cotyledons incumbent. 



1. I. tinctoria L. Biennial; stem 3-10 dm. high; leaves blue-green, the 

 lower oblanceolate, entire or denticulate, the upper sagittate-clasping; racemes 

 several; pod oblong, 12-15 mm. long, 5-7 mm. wide, rounded or retuse at the 

 apex. Waste places: Utah; adv. from Eu. 



2. CARDAEIA Desv. 



Perennial caulescent herbs. Leaves alternate, toothed, the upper clasping. 

 Flowers perfect, in terminal panicles. Petals white. Stamens 6. Ovarv^ sessile; 

 styles slender, but short. Pod ovate, cordate at the base, acute at the B.pex, 

 neither winged nor retuse; valves strongly convex. Seeds solitar>^ in each cavity. 

 Cotyledons incumbent. 



1. C. Draba (L.) Desv. Erect perennial, 2.5-5 dm. high, hoar^'-pubescent, 

 branched above; lower leaves oblanceolate, pe'tioled, the upper oblong, ovate, or 

 cordate, clasping, usually dentate; pod 3 mm, long and 4 mm. broad, papillose; 

 style 1-2 mm. long. Lepidum Draba L. Waste places and cultivated ground: 

 N.Y. — Fla. — Calif. — Ida.: adv. or nat. from Eurasia. Ap-Je. 



