304 



BRASSICACEAE 



V. HlRSUTAE. 

 Stems simple or nearly so; petals 4-5 mm. long, white. 



VI. Whitedianae. 



Coarsely stellate-pubescent; flowers small, white. 



VII. Blepharophyllae. 



Plants with a branched woody caudex; coastal. 



11. A. Irirsnta. 



12. A. Whitedii. 



13. A. blepharophylla. 



14. A. purpurascens. 



Plants from a slender rootstock; montane. 



VIII. Drummondianae. 



Pubescence when present of 2-forked hairs. 



Seeds in 1 row; midrib obscure or absent; basal leaves ciliate on base and petiole; plant otherwise glabrous. 



15. A. Lyallii. 



Seeds in 2 rows; midrib of pod conspicuous; basal leaves with appressed 2-forked hairs, or almost glabrous. 



16. A. Drummondii. 

 Pubescence of 3-4-forked hairs. 



Stems solitary or few from a short crown, strictly erect; pods usually 1.5-2 mm. wide. 



Pods obtuse or acutish, not beaked. 17. A. Bolanderi. 



Pods ascending, sharply acute and tipped by a slender beak. 18. A. acutina. 



Stems very slender and decumbent at base, from a much branched cespitose caudex; pods 1 mm. wide, 



ascending. 



IX. Platyspermae. 



Leaves and lower part of stem stellate. 



Leaves and stems glabrous except for cilia on the petiole. 



Seeds in 2 rows; pods usually 4-5 mm. wide; stem leaves often auriculate. 



Seeds in 1 row; pods 3-4 mm. wide; leaves not auriculate. 



X. Parishianae. 



Cespitose, perennial; stellate-pubescent; leaves linear, sessile. 



XI. Repandentes. 



Biennial, stellate-pubescent; pods 6-8 cm. long, 3-3.5 mm. wide. 



XII. PULCHRAE. 



Stem leaves sessile; seeds in 2 rows. 



19. A. microphylla. 



20. A. platysperma. 



21. A. Howellii. 



22. A. Covillei. 



23. A. Parishii. 



24. A. repanda. 



25. A. pulchra. 



XIII. SUBPINNATIFIDAE. 



26. A. sttbpinnatifida. 



27. A. Beckwithii. 



28. A. suffrutescens. 



29. A. glaucovalvula. 



30. A. perennans. 



31. A. atrorubens. 



32. A. Lemmonii. 



33. A. Br ewer i. 



34. A. Koehleri. 



Stem leaves more or less toothed; pods beaked by a short style. 

 Stem leaves entire; pods acutish; stigma sessile. 



XIV. SUFFRUTESCENTES. 

 Pods attenuate to a short thick style. 

 Pods rounded at each end. 



XV. Perennantes. 



Stems roughish stellate-pubescent; petals 4—5 mm. long. 

 Stems glabrous; petals 8 mm. long. 



XVI. Reconditae. 



Petals 3-4 mm. long. 

 Petals 8-10 mm. long. 



Upper part of stem and pedicels villous-pubescent. 



Upper part of stem and pedicels glabrous. 



XVII. Arcuatae. 



Pedicels sparsely villous with long mostly simple hairs; petals dark purple, 12-15 mm. long; biennial. 



35. A. spar si flora. 

 Pedicels more or less stellate, glabrous in no. 38. 



Short-lived perennial or biennial; stems solitary or few from an unbranched crown; petals pale purple, 



6 mm. long. 36. A. campyloloba. 



Perennial with a branched woody caudex; petals deep reddish purple, 10-12 mm. long. 



Stems and pedicels stellate-pubescent, the latter arcuate-spreading or recurved. 



37. A. maxima. 



Stems, at least the upper part, and pedicels glabrous, the latter ascending. 38. A. Hoffmannii. 



XVIII. Retrofractae. 



Basal leaves ciliolate on the margins. 39. A. rectissima. 



Basal leaves not ciliolate on the margins. 



Plants not cespitose, sparsely to rather densely stellate; basal leaves oblanceolate. 



Capsule 2 mm. wide; seeds in 2 rows in each cell. 40. A. Holboellii. 



Capsule 1 mm. wide; seeds in 1 row in each cell. 41. A. secunda. 



Plants cespitose, hoary with a dense stellate-pubescence; basal leaves linear. 42. A. puberula. 



1. Arabis filifolia Greene. Island Rock-cress, Thread-leaf Rock-cress. Fig. 2097. 



Cardamine filifolia Greene, Pittonia 1 : 30. 1887. 

 Arabis filifolia Greene, Bull. Calif. Acad. 2: 390. 1887. 

 Sibara filifolia Greene, Pittonia 3: 11. 1896. 



Annual, glabrous and somewhat glaucous, the stems erect, slender, branching above, 2-3 dm. 



