RYDBERG: STUDIES ON THE Rocky MowunrTAIN FLORA 111 
months earlier. As the latter is the type of Hookera, Brodiaea 
becomes a pure synonym. Dr. Greene,* who was the first to 
segregate into genera the members of Brodiaea taken in the sense 
of Dr. Watson, retains both genera. Evidently he regarded 
Smith’s second species, Brodiaea congesta, as the type. This 
can scarcely be done, as B. grandiflora is not only the first species, 
but it is more extensively described and discussed. Greene 
himself afterwards discarded Brodiaea and adopted Dichelostemma, 
proposed by Kunth on Brodiaea congesta Smith. Alphonso Wood 
had extended Kunth’s genus to include also B. capitata Benth. 
and B. volubilis Baker (Stropholirion californicum Torr.). Wood 
was followed by Greene in including these species in the 
genus. Stropholirion has been generally recognized as a genus, 
even by S. Watson. The typical species of Dichelostemma, i. e., 
D. congesta (Smith) Kunth and its relative D. multiflora (Benth.) 
Heller, have only 3 stamens alternating with 3 staminodia and 
differ from the typical species of Hookera only in the rounded 
base of the perianth and the subcapitate inflorescence. If they 
are kept distinct then Seubertia should be regarded distinct from 
Triteleia. Brodiaea capitata has 6 fertile stamens with subulate 
filaments. At the base of each of the inner three there are two 
lanceolate lobes partly adnate to the perianth, forming together 
a crown of 6 instead of 3 members. To the new genus proposed 
here, belong: : 
‘Dipterostemon capitatus (Benth.) 
Brodiaea capitata Benth. Pl. Hartw. 339. 1857. 
~ Dipterostemon pauciflorus (Torr.) 
Brodiaea capitata pauciflora Torr. Bot. Mex. Bound. Surv. 218. 
‘1859. 
Dipterostemon insularis (Greene) 
Brodiaea insularis Greene, Bull. Calif. Acad. Sci. 2: 134. 1887. 
“Dipterostemon pulchellus (Salisb.) 
Hookera pulchella Salisb. Parad. 2: pl. 117. 1808. 
NEw Yorr BOTANICAL GARDEN. 
* Bull. Calif. Acad. Sci. 2: 125-144. 1886. 
