170 Coville and Leiberg Two New Plants from Oregon. 



ends; the leaves not very stiff and with only an abrupt, very 

 short, and scarcely pungent horny apex ; and the sepals with 

 the green median portion rather narrow, usually abruptly de 

 limited by the broad hyaline margins, and commonly with little 

 tendency to be striate when dry. Arenaria aculeala is a plant 

 with spreading, procumbent, matted stems retaining their more 

 scattered widely spreading dead foliage for several years ; the 

 leaves stiff, tapering at the apex into an extremely sharp horny 

 spine ; and the sepals with a broad midrib not usually sharply 

 delimited and when dry commonly 3 to 5-striate. In the field 

 the plants are at once distinguishable by their strikingly differ 

 ent habit and by the difficulty of handling aculeata, the leaves 

 of which readily pierce the skin, a difficulty which was not ex 

 perienced in the case of pumicola. 



Our plant is a characteristic species of the open slopes of 

 pulverized pumice-stone about the rim of Crater Lake, Mount 

 Mazama, Oregon, and specimens in the National Herbarium 

 collected by Lemmon in 1875 show that it occurs also in north 

 eastern California. Arenaria aculeata ranges from the plateau of 

 northern Arizona through the mountains of Nevada and Utah 

 to those of southwestern Idaho and eastern Oregon. 



Our plant bears considerable resemblance to some herbarium 

 specimens which are referred to Arenaria congesta subcongesta 

 Wats., but the type of that complex of forms differs in its spread 

 ing instead of erect leaves, slenderer and more persistently leafy 

 branches of the rootstock, longer calyx (about 5 mm.) and gla 

 brous stems and inflorescence. 



Cardamiiie bellidifolia pachyphylla, var. nov. 



Plant wholly devoid of pubescence, low, 4 to 8 cm. high, from a branch 

 ing candex commonly 2 mm. thick, and with a deep tap root, the branches 

 usually short, but sometimes long and flexuous ; leaves mostly gathered 

 in subrosulate tufts at the ends of the caudex branches, the blades fleshy 

 in texture, even the midrib nearly obliterated, 6 to 12 or even 16 mm. 

 long, obovate to narrowly oblong, rounded at the apex, entire or with 

 an indistinctly defined lobe on either side toward the apex, abruptly or 

 gradually narrowed into petioles 1 to 3 cm. in length and purplish at the 

 base or throughout ; flowering stems short, erect, 1 or 2 from each branch 

 of the caudex, 3 to 5 cm. high, leafless or bearing one or two short- 

 petioled oblanceolate or obovate leaflets ; inflorescence a short terminal 

 raceme, the flowers seldom more than 10, on pedicels commonly 5 to 10 

 mm. long; sepals 2 to 3 mm. long; petals a little more than twice as 

 long, spatulate, obtuse, white or rose-colored ; siliques about 3 cm. long 



