OF ARTS AND SCIENCES. 41 



tusis sessilibus margine clenticulatis vel integriusculis, rete laxa vix 

 prominul.i ; capitulis jiedicellatis parvulis (vix semipollicaribus) ; in- 

 volucro G-7-floro pauciseriali e bracteis oblongo-linearibus obtusis lin. 

 2-3 longis cum paucis exterioribus brevioribus ovalibus ; corollis ut 

 videtur roseis ; acbeniis minute glanduloso-pnberulis. — Gravelly 

 slopes, near San Luis, flowering in spring and again in autumn. No. 

 547. in part. This is no. 234 of Coulter's Mexican collection, from 

 Zimapan ; and the species seemingly has not before been taken up. 

 In the distribution it was accompanied by the following. 



Perezia oxyeepis. Ilerbacea, puberula, subglanduloso-scabrida, 

 ramosa ; ramis patentibus foliosis laxe paniculato-polyeephalis ; foliis 

 (superioribus) tenuiter papyraceis oblongis acutis creberrime spinuloso- 

 denticulatis basi auriculis laciniato-deutatis subclausis amplexicaulibus, 

 venis primariis prominulis parum reticulatis ; capitulis pedicellatis 

 (lin. 9 longo) ; involucro 14-lG-floro pauciseriali; bracteis omnibus 

 lanceolatis tenuiter acuminatis dorso glanduloso-puberis (intimis semi- 

 pollicem longis) ; acheniis glanduloso-pubescentibus. — No 547 in part. 

 In the distribution of Liebmann's plants from Copenhagen, his 351 is 

 said to consist of " Acourtia carpholepis and A. oxylepis, Scb. Bip." 

 We possess only the former. That has such resemblance to the 

 plant here characterized that I venture to take up the latter name, 

 which in any case is appropriate to the present plant. 



2. Some New North American Genera, Species, $c. 



SUKSDORFIA, Nov. Gen. Saxifragearum. 



Calycis tubus campanulatus, ovario adnatus, ultra eum vix produc- 

 tus ; lobi 5 angusti (sa?pe attenuati) erecti, restivatione leviter imbri- 

 cati. Petala 5, sinubus calycis inserta, longe unguiculata, marcescenti- 

 persistentia, lamina oblongo-lanceolata vel spathulata, nunc iutegra 

 nunc 1 vel 2 trilobata, restivatione imbricata. Stamina 5, petalis al- 

 terna : anthera? subsessiles, breves. Ovarium inferum, biloculare, 

 apice breviter birostre : stigmata truncata. Capsula ovalis, calycis 

 lobis conniventibus coronata, inter rostra dehiscens ; placenta? axiles 

 polyspermy. Semina subquadrata, angulis scabridis exceptis la3via. 

 Embryo in axi albuminis parvus. — Herba tenera, viscidulo-pubens, 

 Saxifragis Nephrophyllis sat similis ; radice bulbilifero-granulifera; 

 foliis radicalibus reniformi-rotundatis lobatis petiolo basi dilatata seti- 

 fero, caulinis inferioribus petiolo basi quasi foliaceo-stipulatis, superi- 

 oribus quasi panduratis, basi stipuliformi amplexicauli crenato-incisa 



