286 



[Vol. 9 



GARDEN 



near Manzana, Antelope Valley, May !)-24, 1890, Davy 2469 

 (Univ. Calif. Herb.); Lytle Creek Canyon, San Antonio Moun- 

 tains, June 1-3, 1900, Hall 1436 (Univ. Calif. Herb.); Mt. San 

 Antonio, San Bernardino County, July 12, 1902, Ahrams 2699 

 (Mo. Bot. Card. Herb.) ; San Francisquito Pass, May 3, 1902, 

 Hall 3101 (Univ. Calif. Herb.). 



Because of the entire stigma this plant is somewhat anomalous 

 in Caulanthus and approaches the Sisymbrioid genera. The floral 

 characters are, however, those of Caulanthus and in this group it 

 seems to find its nearest allies. 



So closely related to this species is Streptanthus campestris 

 Wats, that in an immature condition the two are likely to be 

 confused. That species seems to be biennial rather than annual, 

 is a stouter plant than C. amplexicaulis, has winged seeds and a 

 septum with tortuous cell walls. The sepals in the Caulanthus 

 species are glabrous, while in S. campestris they are sparingly 

 hirsute at (he apex. S. campestris might, without offense to 

 phylogeny, be united with Caulanthus except that there is per- 

 haps a more definite line of cleavage between this species and 

 Caulanthus than between it and other Streptanthus species. Ac- 

 cordingly, unless Streptanthus be merged with Caulanthus, here 

 is the logical point of division. 



2. C. sulfureus Payson, n. sp. 1 



Root and lower part of the stem unknown, glabrous and glau- 

 cous above: stem branched in the inflorescence, rather stout: 

 upper cauline leaves ovate, acuminate, amplexicaul at the base 

 with rounded lobes, 3-5 cm. long: sepals yellowish, nearly equal, 

 about 5 mm. long, lateral pair slightly saccate at the base; petals 

 yellow, oblanceolate, 1-1.5 times as long as the sepals, scarcely 

 clawed, margin slightly sinuate-dentate; filaments distinct, 

 strongly tetradynamous, linear, 3-5 mm. long, anthers shortly 

 apiculate, 2-3 mm. long; nectar glands 4, well developed: in- 

 florescence corymbose or shortly racemose at first, elongating 

 when mature; pedicels slender, ascending, 10-13 mm. long: pods 



'Caulanthus sulfureus sp. now, glnbrus glaucus; radicc et caule inferno ignoto, 

 cauJo siijicrno ranmso robusto; foliis canlinis integris ovatis acuminata 3-5 cm. 



longis amplexicaulibus, lobis basi rotundis; scpalis subflnvis circiter 5 mm. longis, 

 lateralibua subsaccatis, petalis flavis oblanccolatis 5-8 mm. longis, filamentia tetra- 



dynamis .'{-5 nun. longis distinctis; infloroscentiis priino corymbosis, serius race- 

 mosis, pedicel lis gracilibus patentibus 10-13 mm. longis; siliquis (immaturis) erec- 

 tis RUbsessilibus circiter 1.5 cm. longis, stylo 1.5 mm. longo, stigmate subbilobo. — 

 Collected on Santa Cruz bottoms near Tucson, Arizona, March 13-April 23, 1903. 

 David Griffiths 4058 (Mo. Bot. Gard. Herb., type). 



