WOOTON AND STANDLEY FLOKA OF NEW MEXICO. 273 



KEY TO THE SPECIES. 



Pods emarginate, the sinus narrow 1 . T. coloradense. 



Pods truncate or nearly so, the sinus broad and open. 



Cauline leaves ovate, 18 to 25 mm. long; pedicels slender, 8 



to 10 mm. long; pods 5 mm. ^nde 2. T.fendleri. 



Cauline leaves oblong, 15 mm. long or less; pedicels stout, G 



mm. long or shorter; pods not more than 2.5 mm. wide. 



Stems 20 to 30 cm. high, slender; cauline leaves broader 



than the basal ones; sepals green 3. T. (jlaucum. 



Stems 10 cm. high or less, stouter; cauline leaves not 



broader than the basal ones; sepals purplish 4. T. purpurascens. 



1. Thlaspi coloradense Rydb. Bull. Torrey Club 28: 280. 1901. 

 Type locality: Bald Mountain near Pikes Peak, Colorado. 

 Range: Colorado and New Mexico. 



New Mexico: Chama; Las Vegas Hot Springs; Sierra Grande. Mountains, in the 

 Transition Zone. 



2. Thlaspi fendleri A. Gray, PI. Wright. 2: 14. 1853. 



Type locality: Organ Mountains, New Mexico. Type collected by Wright (no. 

 1322). 



Range: New Mexico. 



New Mexico: Cooney; Hillsboro Peak; Organ Mountains. Canyons in the moun- 

 tains, in the Transition Zone. 



Perhaps, judging from the specific name and from the citation of synonymy, Fend- 

 ler's 44 should be taken as the type of this species. Doctor Gray's description, how- 

 ever, eAddently applies to the very different plant of southern New Mexico, and 

 Wright's specimens are the only ones cited. If Fendler's plant were taken as the 

 type, the specimens here listed should have a new name. 



3. Thlaspi glaucum A. Nels. Bull. Torrey Club 25: 275. 1898. 



Thlaspi alpestre glaucum A. Nels. Wyom. Agr. Exp. Sta. Bull. 28: 84. 1896. 

 Type locality: La Plata Mines, Wyoming. 

 Range:' Idaho to central New Mexico. 



New Mexico: Winsors Ranch; San Mateo Mountains; Kelly; Cloudcroft; Chama; 

 Pecos Baldy. ^leadows under pine trees, in the Transition and Canadian zones. 



4. Thlaspi purpm-ascens Rydb. Bull. Torrey Club 28: 281. 1901. 

 Type locality: Arizona. 



Range: Colorado to Arizona and New Mexico. 



New Mexico: Hermits Peak; Stinking Lake. Mountains, in the Transition Zone. 



15. BURSA Weber. Shepherd's-purse. 



Branched annual with a rosette of narrow pinnatifid leaves; flowers small, white; 

 silique obcordate-triangular, flattened contrary to the partition. 



1. Bursa bursa-pastoris (L.) Web. Prim. Fl. Hols. 41. 1780. 



Thlaspi bursa-pastoris L. Sp. PI. 647. 1753. 



Capsella bursa-pastoris Medic. Pflanzengat. 1: 85. 1792. 



Type locality: "Habitat in Europae cultis ruderatis." 



New Mexico: Winsors Ranch; Kingston; Las Huertas Canyon; Gallinas Canyon; 

 Pecos; Mesilla Valley; Gilmores Ranch; Chama. 



A very common weed in the Eastern States, introduced from Europe. So far it is 

 rather rare in New Mexico, but occurs occasionally in irrigated fields and in gardens. 

 Doubtless it wdll become more common. The plant may l>e recognized b)' the trian- 

 gular-cuneate silicle which gives rise to the popular as well as the Latin name. 

 52576°— 15 18 



