1919] Fernald,— Arenaria sajanensis 15 
According to Index Kewensis, Arenaria alpina Porter & Coulter, 
Syn. Fl. Colo. 14 (1874) is A. obtusa Torr., but it is in every way 
inadvisable to take up the name. Porter & Coulter obviously sup- 
posed they were listing a Linnean species, although Linnaeus had no 
A. alpina. They cite Alsine biflora Wahl, as a synonym, i. e. Aren- 
aria sajanensis Willd; their description of the leaves as "narrowly 
linear, 3"—33" long" belongs clearly to A. sajanensis, not A. obtusa 
Torr. and their citation, Hall & Harbour 77 is inconclusive, since 
no. 77, at least in the Gray Herbarium, is a mixed number, consisting 
mostly of 4. sajanensis. 
The name Alsinopsis obtusiloba Rydberg is not much clearer in 
its application, although it may be fairly inferred that Rydberg was 
changing the name of Arenaria obtusa 'Torr. on account of Allioni's 
earlier species of that name. But the other citations given by Ryd- 
berg are not helpful: Ar. biflora Wats. was based definitely on Alsine 
biflora Wahl. and is, therefore, Ar. sajanensis Willd; while * Arenaria 
sajanensis Robinson, Proc. Am. Acad. 29: 304. 1894. Not A. 
sajanensis Willd. 1816” was largely A. sajanensis Willd, but with all 
the species here discussed, A. obtusiloba, A. marcescens and A. larici- 
folia? confused with it. Only through inferring, then, that Rydberg’s 
Alsinopsis obtusiloba was intended as a renaming of Ar. obtusa Torr. 
does Rydberg’s name become definite. 
A. marcescens, n. sp., dense caespitans, caudiculis epigaeis lignes- 
centibus ramosissimis 0.5-2.5 dm. longis, foliorum remnantibus 
marcescentibus rigidis imbricato-tunicatis; foliis coriaceis viridibus 
glaberrimis lineari-setaceis obtusis 4-8 mm. longis 0.3-0.5 mm. latis, 
nervo crasso; cauliculis adscendentibus 2-5 cm. altis 1-floris glandu- 
loso-pilosis remote bracteatis, bracteis 2-4-jugis lanceolato-subulatis; 
pedunculo 0.6-1.5 em. longo; calycibus purpurascentibus vel fuscis 
turbinato-campanulatis 3.8-5 mm. longis basi plus minusve pilosis, 
sepalis oblongis vel oblongo-lanceolatis obtusis valde carinatis ple- 
rumque nerviis lateralibus; petalis spathulatis vel spathulato-obovatis 
albis vel lilacinis basi luteis 6-8 mm. longis 2-2.5 mm. latis; antheris 
albidis 0.5-1 mm. longis; capsula subcylindrica 0.6-1 cm. longa; 
valvis coriaceis stramineis lineari-oblongis apice emarginatis; semi- 
nibus olivaceis vel brunneis reniformi-obovatis, laevissimis 0.8-1.2 
mm. longis apice radiculari rostellata. 
Densely cespitose, with the trailing and freely forking lignescent 
branches 0.5-2.5 dm. long and closely covered with the rigid marces- 
cent remnants of the leaves: leaves coriaceous, bright green, strictly 
glabrous, linear-setaceous, obtuse, 4-8 mm. long, 0.3-0.5 mm. wide, 
with a thick midrib: flowering stems ascending, 2-5 cm. high, 
