MUSTARD FAMILY 357 



Leaves not coarsely hirsute; perennials. 



Pubescence, if any, sparse and consisting of 2-forked or rarely 3-forkod hairs. 



IV. Dhxjmmondianae. 

 Pubescence of at least the lower leaves decidedly stellate. 



V. MTruOPHYLLAE. 



Pods spreading or reflexed. 



Pods and calyx stellate, VI. PULCHRAE. 



Pods not stellate. 



Pods 3^ mm. wide. VII. Suffrttescextes . 



Pods 1-2.5 mm. wide. 



Pods spreading or somewhat recurved on spreading pedicels. 



Pods only 1-1.5 mm. wide. Vlll. :MacouniaXAB. 



Pods 1.5-2.5 mm. wide. 



Perennials, with a caudex. 



Plant tall, 3 dm. or more high, suffruticose at the base. 



IX. Perennantes. 



Plant low, 1-2 dm. high, cespitose. X. Reconditae. 



Stout biennials or short-lived perennials, 3 dm. high or more. 



XI. Ahcuatae. 



Pods and pedicels reflexed. XI 1. Retrofractae. 



I. Lyratae. 



Pods about 0.75 mm. wide; style more than 0.5 mm. long. 1. A. lyrata. 



Pods fully 1 mm. wide; style almost obsolete. 2. A. ammgua. 



II. Furcatae. 



Seeds not winged; leaves hairy; pods 1 mm. wide or less. 3. A. NuitaUii. 



Seeds winged at the lower end; leaves merely ciliate on the margins; pods 1.5-2 mm. wide. 



HlRSUT 



mm 



yellowish white, less than twice as long as the sepals. 5. A. orata. 



Two of the sepals with strongly saccate bases, almost twice as broad as the others ; petals 

 6-10 mm. long, pure white. fuUy twice as long as the sepals. 6. A. rupestris. 



IV. Drummondlinae. 



Stems 3 dm. high or more, solitary or 2 or 3 from the same root. „ , ^ ,.. 



Pods about 1.5 mm. wide. J- ^- Drummondiu 



Pods about 3 mm. broad. ^ 8. v4. connexa. 



Stems less than 3 dm. high, several from a cespitose caudex. 



Pods strictly erect, blunt. ^nA r^n^]?^' 



Pods rather ascending, acute. ^^- ^- -^i/"*"*- 



V. ISIrCROPHYLL.'^E. 



stems more than 3 dm. high; basal leaves 3-10 cm. long. 11. A, oblanceolata. 



Stems usually less than 3 dm. high, from a branched caudex; basal leaves 1-2 cm. long. 

 Plant green; petals 7-8 mm. long; pods fully 2 mm. wide; ^t^^^-^^f J^^^'^^^^y^^^ 



Plant grayish; petals about 5 mm. long; pods 0.75-1.5 mm. wide; stem-leaves oblong 



or linear, the lower oblanceolate. i, * o « «i ^^. .+.>rv» i.tnc,it^ 



Flowers few; pods more than 1 mm. wide; seeds somewhat 2-^^^^^^^|^^,^^[f^"^" 



Flowei^s^many^^^^ 1 mm. wide; seeds strictly ^^ J^ ^^^ = S,^^^ 



stellate. 1^' ^- ^^'^o"^^''"- 



VI. PULCHR-VE. 



Seeds distinctly in two rows; stem-leaves not auricled. r^uirhm 



Petals purple, 8-10 mm. long. j^* -J' fnrTnnJn 



Petals white, 10-12 mm. long. . , j * i - c 



Seeds in one row; stem-leaves more or less auncled; petals o-^ ^7"~r 'iuhnirinatinda 



Leaves usually coarsely toothed; petals pmk. 6-8 mm. long. 17. A. ^""l^]!}^^^^^^ 

 Leaves entire; petals wliite, 5-6 mm. long. 1»- ^- J^^(^cuQuyani. 



VII. Stjffrutescextes. 



Stems suffrutescent at the base; pods reflexed. 19. A, ^f^^lf^f^^t^' 



Stems not suffruticose; pods spreadmg. 20. A, drepanoiooa. 



VIII. Macounlvx-^^. 

 Petals about 4 mm. long; pod 3^ cm. long; basal leaves 1-2 cm. lo^^^^.^^ Macounii, 



Petals about 8 mm. long; pod 4-6 cm. long; basal leaves 4-6 cm. long.^ arcoidea. 



IX. Perenx.vntes. 'nerennans 



One species. ^^- ^- ^^^^""«"*- 



X. Recondit.ie. 



Leaves finely stellate. 



Leaves thick canescent; stems simple. ^ Lemmonii, 



Pod about 1.5 mm. wide, acute. ^^' ^' 



formosa 

 mm 



