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140 Rhodora [Aucusr 
Ryncnospora Careyana, n. nom. Ceratoschoenus macrostachyus, 
var. patulus Chapman, Fl. 529 (1860). R. corniculata, var. patula 
Britton, Trans. N. Y. Sci. xi. 84 (1892). R. macrostachya, var. 
patula Chapman, Fl. ed. 3, 556 (1897). 
Typical R. corniculata (Lam.) Gray has the achenes round-obovate 
and twice as broad as the base of the tubercle, the achenes measuring 
5-6 mm. long, 2.8-3.3 mm. broad. This plant, as already stated, 
extends from Florida northward to Delaware and westward to Louisi- 
ana, thence north to Missouri. The commoner plant westward, in 
Texas and Arkansas, locally northward to Indiana and occasionally 
eastward to Alabama, has a more slender achene which at the summit 
is scarcely broader than the base of the tubercle, so that the two seem 
nearly confluent. In this plant the somewhat duller achenes measure 
4.5-5.3 mm. long, 2.4-2.6 mm. broad, but its perianth-bristles and 
aspect are quite like those of typical R. corniculata. Differing only 
in the much narrower and somewhat shorter achene and conspicuously 
overlapping the range of R. corniculata, the plant is probably best 
treated as a geographic variety, which is here proposed as 
RYNCHOSPORA CORNICULATA (Lam.) Gray, var. interior, n. var., 
achaeniis fuscis 4.5-5.3 mm. longis 2.4-2.6 mm. latis cum tuberculis 
subconfluentibus.— Alabama to Texas, Arkansas, and Indiana. 
TYPE: swamps, southern Arkansas, F. L. Harvey, no. 24 (Gray Herb.). 
Briefly summarized the distinctions between the species above 
discussed may be stated as follows: 
Pristles mcstly exceeding the achene; the longest 4.4-14 mm. long. 
Plant non-stoloniferous: inflorescence fastigiate; the primary glomerules 
with 10-50 spikelets; achene 5-6 mm. long: tubercle 1.9-2.2 em. 
long: bristles 6, 1.1-1.4 em. long.......... R. macrostachya Torr. 
Plant loosely stoloniferous: inflorescence diffuse; the primary glomerules 
with few spikelets: achene 4.2-4.8 mm. long: tubercle 1-1.8 cm. long: 
bristles 4—6, the longer 4.4-11 mm. long. 
Achene 2.2-2.6 mm. broad; tubercle 1.5-1.7 cm. long: bristles 6 
(rarely 5), the longest 9-11 mm. long. . R. inundata (Oakes) Fernald. 
Achene 3-3.5 mm. broad; tubercle 1-1.4 cm. long: bristles 4 (rarel 
5 or 6), the longest 4.4-8 mm. long........ R. Careyana Fernald. 
Bristles much shorter than the achene, all but 1-3 very short or nearly obso- 
lete; the longest 2.5-4 mm. long: plant apparently not stoloniferous.! 
Achene 5-6 mm. long, 2.8-3.3 mm. broad, twice as broad as the base of 
the tubercle, ....................:000+0.d commtculaia (Lam.) Gray. 
Achene 4.4-5.3 mm. long, 2.4-2.6 mm. broad, the summit scarcely broader 
than the base of the tubercle... .. R. corniculata, var. interior Fernald. 
Gray HERBARIUM. 
1 The herbarium material shows only fragmentary bases but these lack the loosely divergent 
stolons so characteristic of R. inundata and of R. Careyana. Further observations and better 
collections may show definite stolons in R. corniculata. 
—_ a 
