274 Rydberg : Some Generic Segregations 



structure of the fruit they are so unlike the rest of the species. 

 The segregated genera would be distinguished as follows : 



Styles club-shaped ; stigmas slightly 2-lobed ; receptacle flat ; shrubs, unarmed, with 

 shreddy bark and digitately ribbed maple-like leaves. 

 Drupelets capped by hard hairy cushions ; styles glabrous ; erect shrubs. Rubacer. 

 Drupelets without cushions ; styles hairy ; prostrate or reclining vines. Oreohatus. 

 Styles filiform, glabtous ; stigmas usually capitate ; receptacle hemispherical, conical or 

 nipple-shaped ; drupelets without cushions ; leaves in most species pinnate and 

 stem in most prickly. Rzibtts. 



Rubacer gen. nov. 



Unarmed shrubs with more or less shreddy bark, more or less 

 glandular above. Leaves petioled, simple, digitately ribbed and 

 lobed, with acute or acuminate lobes and cordate bases, resem- 

 bling the leaves of certain maples. Flowers showy, in small 

 panicles : sepals ovate with long slender acuminations : petals pink 

 or white, oval or rounded : pistils numerous : receptacle flat or 

 nearly so : drupelets numerous, capped with a dry, rather hard, 

 finely and densely pubescent cushion with the club-shaped style 

 attached under the margin. 



The type is the first species cited below. 



1. Rubacer odoratum (L.) ; Rnbus odomtiis L. Sp. PI. 494- I753- 



2. Rubacer parviflorum (Nutt.); Rubus parvifloms Nutt. Genera 



i: 308. 1818; Rubiis Niitkanus Moc; Seringe, DC. Prodr. 

 2 : 566. 1825. 



3. Rubacer tomentosum ; Rubus vdutinus Hook. & Arn. Bot. 



Beechey Voy. 140. 1841 ; Not Vest. 1823. 



4. Rubacer Columbianum (Millsp.) ; Riibus odomtiis var. Cohim- 



bianus Millsp. Bull. W. Va. Agr. Exp. Sta. 2: 355. 1892. 



Oreobatus gen. nov. 



Prostrate or reclining shrubby vines with light colored, shreddy 

 bark. Leaves petioled, simple, maple- or gooseberry-like, digi- 

 tately ribbed and lobed with rounded serrate lobes. Flowers 

 showy, usually solitary : sepals ovate or ovate-lanceolate, acumi- 

 nate or the tips foliaceous, in fruit erect: petals white, 1.5-3 cm. 

 long, broadly obovate : stamens very numerous, hiding the fewer 

 pistils : receptacle flat or nearly so : styles club-shaped, curved ; 

 stigma somewhat 2-lobed ; young fruit apparently very pubescent, 

 owing to the hairy styles : drupelets not very fleshy, without hairy 

 cushions. 



The first of the following two species is regarded as the type : 



