MUSTARD FAMILY 323 



Anthers not subsaf;ittate at the base. 



Pod short, from orbicular to linear-oblong. 



39. Draba. 

 Pod elongated-linear. 



Cotyledons acciimbent. 40. Arabis. 



Cotyledons incumbent. 23. Conringia. 



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. Phaenicaulis. 



2. Anthers sagittate at the base. 



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

 Cotyledons accimibent; stem not succulent; flowers small. 



43. Cartiera. 

 Cotyledons incumbent; stem more or less succulent; flowers comparatively 

 large. 44. Caulanthus. 



Calyx canipanulate, open; petals ample. 



Pod flat; anthers neither curved nor twisted. 

 Stigma 2-lobed. 



Lobes of the stigma over the placentae; perennials. 



41. Parrya. 

 Lobes of the stigmas over the valves; annuals. 45. Streptantella. 

 Stigma entire, capitate; seeds marginless. 



Cotyledons obliquely accumbent; low perennials, with pink or 



puri)lish flowers. 42. Phaenocaulis. 



Cotyledons incumbent; tall leafy plants, with greenish flowers. 



46. Chlorocrambe. 

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

 crambe). 

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



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 witli creeping rootstocks. 47. Schoenoctiambe. 



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. Hesperidanthus. 

 Stigma truncate; sepals scarcely gibbous at the base. 



Septum of the pod without a distinct midrib. 



51. TlIELYPODH™. 



Septum of the pod with a strong midrib. 



52. Pletirophragma. 

 Sepals strongly spreading or reflexed in anthesis, soon deciduous. 



53. Stanleyella. 



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

 and spirally twisted. 54. Stanleya. 



1. ISATIS L. WoAD. 



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

 ascending-spreading, not gibbous at the base. Petals yellow, entire, equal. 

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

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

 without style. Cotyledons incumbent. 



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

 lower oblanceolatc, 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. CARDARIA Desv. 



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

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

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

 neither winged nor retuse; valves strongly convex. Seeds solitary in each cavity. 

 Cot;^dedons incumbent. 



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

 branched above; lower leaves oblanceolate, petioled, 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. 



