Novitates Boreali-A mericanae. II. 243 
The short leafy stems bear much likeness to those of some dwarf alpine 
species of Epilobium, 
11. Arabis Leibergii Greene, nov. spec. 
Planta basi suffrutescens, habitu A. platyspermae, at omnino glabra, 
glaucescens; foliis infimis latiuscule oblanceolatis acutis tenuiter petiolatis, 
caulinis ovalibus sessilibus breviter auriculatis; siliquis erectis, 2,5—4 cm 
longis, 5 cm latis; seminibus late ovalibus, alatis, duplici ordine dispositis. 
At subalpine elevations of the Grayhart Buttes, Oregon, collected 
by Messrs. Coville and Leiberg, 7 Aug. 1896, and distributed under 
their no. 262. 
12. Arabis inamoena Greene, nov. spec. 
Planta parvula perennis erecta vix ima basi lignosa; caulibus 
tenuibus 1—1,5 cm altis; foliis inferioribus oblanceolatis acutis, 1—2 cm 
longis, caulinis oblongis sessilibus 1 cm longis, omnibus cauleque pube 
brevi plerumque trifurca sparsim indutis; floribus perpaucis, petalis 
albidis brevibus erectis sepalos stellato-pubescentes vix superantibus; 
siliquis latiusculis, 4—5 cm longis, acuminatis; seminibus unica serie 
dispostis. 
Subalpine in the mountains of Tulare County, California, at Long 
Meadow; collected by Edward Palmer, June 1888; distributed under 
no. 192. Notable in this group for its pubescent sepals and very short 
colorless petals. 
13. Arabis Covillei Greene, nov. spec. 
Planta 2 dm alta, ramis paucis rigidulis adscendentibus paucifloris e 
caudice tenui simplici; foliis infimis oblanceolatis acutis glabris, parte 
inferiori petioloque pilis rigidis simplicibus parum incurvis sparsim ciliatis, 
caulinia oblonga, sessilia, undique glaberrima; petalis atrorubentibus 
sepalos glaberrimos valde superantibus; siliquis lanceo-linearibus acu- 
minatis 5—6 cm longis; seminibus uniserialibus. 
Mountain regions of southeastern California, collected by Mr. 
Coville on the Death Valley expedition, being his numbers 1492 and 
1515 of that collection. Very distinct from true A. platysperma by its 
glabrous foliage, only the margins of the lower parts of the basal leaves 
being ciliate. 
14. Arabis conferta Greene, nov. spec. 
Planta praecedenti. aemula, multo humilior, 1 dm alta, confertim 
multicaulis, erecta, ima basi fruticulosa; foliis oblanceolatis obtusis 
glaucescentibus, utrinque glabris, solummodo margine pilis tenuibus 
brevibus apice bifurcis obsitis; siliquis pro planta magnis, 4—5 cm longis 
breviter acuminatis; seminibus uniserialibus. 
Slopes of mountains at subalpine and alpine elevations on head 
waters of Little Kern River, California, collected by C. A. Purpus in 
1897; the specimens numbered 5231. The siliques are larger than the 
whole plant below them. 
15. Arabis oligantha Greene, nov. spec. 
Caules pauci tenues rigidiusculi, 2—3 dm alti, ad basin lignosam 
16* 
