RYDBERG: SOME GENERIC SEGREGATIONS 275 
1. O. deliciosus (James); Rubus deliciosus James; Torr. Ann. 
LyGN, Ye: 190 1828, 
2. O. Neo-Mexicanus (A. Gray); Rubus Neo-Mexicanus A, Gray, 
Pi, Waeht 2: 58§..) 18539. 
III. A similar inconsistency we find in the Loasaceae, where the 
genus Mentzelia as it is represented in United States is composed 
of at least four distinct groups deserving generic rank * with just as 
good right as several other recognized genera in the family. 
The principal distinguishing characters are: 
Placentae with horizontal lamellae between the seeds ; these in 2 rows. 
Filaments 3-cleft at the apex, the middle tooth bearing the anthers, the lateral 
teeth cuspidate ; seeds angled or with folds, not winged ; annuals, 
Bicuspidaria. 
Filaments not cleft ; seeds very flat, more or less winged; perennials. 
Touterea. 
Placentae without lamellae ; seeds usually prismatic. 
Placentae slender, filiform ; ovules in one row, 10-403; seeds minutely muricate, 
not striate ; filaments free or nearly so. Acrolasia. 
Placentae broad, band-like; ovules in 1-2 rows, few; seeds distinctly striate, 
often rugose ; filaments at the base united with the petals into a ring. 
Mentzelia. 
Bicuspidaria (S. Wats.) gen. nov. 
Mentzelia § Bicuspidaria S, Wats. Proc. Am. Acad. 20: 367. 
1885. 
Annuals with rather large flowers. Petals 5, free; stamens 
80-130, dilated, 3-cleft at the apex, the middle tooth bearing 
the anthers; placentae with a vertical wing and horizontal la- 
mellae between the ovules and seeds; these 15-40 in 2 rows on 
each placenta ; capsule cylindric, inflated, sessile, thin-walled; seeds 
irregular, angled or with folds, not winged. 
The first of the following species is taken as the type. 
1. B. tricuspis (A. Gray); Mentzelia tricuspis A. Gray, Am. 
mat. QO: 271. 1875. 
2. B. involucrata (S. Wats.); Mentzelia involucrata S. Wats. 
Proc. Am. Acad. 20: 367. 1885. 
3. B. hirsutissima (S. Wats.); Menizelia hirsutissima S. Wats. 
Froe. Aim. Acad. (2+ 253: 1877. 
* It may be that the other three sections of Urban and Gilg, viz., Micromentzelia, 
Octopetaleia and Dendromentzelia should also be treated as genera; but better knowl- 
edge is needed. 
