OF ARTS AND SCIENCES. 275 



PRIONOSCIADIUM j new genus of Umbelliferce, near Angelica. 

 Calyx-teeth very short, but nearly equalling or exceeding the de- 

 pressed stylopodium. Fruit round-ovate, dorsally compressed, with 

 a broad commissure ; lateral jugas expanded into lateral wings, the 

 intermediate and dorsal somewhat prominent or slightly winged ; 

 vittna several in the intervals and on the commissure. Carpophore 

 2-parted. Seed dorsally compressed, the margins infolded. — Erect, 

 caulescent, with ample twice or thrice pinnate or pinuatifid leaves and 

 mostly lobed or decompound leaflets, and compound umbels with 

 no involucres and small involucels. Distinguished from Angelica 

 (Arcluingelica) chiefly by the infolded seed. The name has reference 

 to the mountain habitat of Pringle's specimens (irpuw, a saw, sierra). 



Prionosciadium Madrense. Perennial (?), 2 or 3 feet high, 

 much branched, glabrous excepting the somewhat scabrous petioles 

 and inflorescence : petioles shortly dilated at base ; lower leaves thrice 

 pinnate, the uppermost simply pinnate ; leaflets lanceolate in outline, 

 pinnatilid with rather small incised segments: peduncles short; umbels 

 6-10-rayed, the rays about an inch long; involucels of a few linear 

 acuminate bracts ; pedicels 1 to 3 lines long : fruit glabrous, 3£ to 5 

 lines long by 2^ to 3 J broad, the wings nearly as broad as the seed ; 

 vittaa in the intervals 3, very narrow and irregular, on the commissure 

 6, broad and thick. — On ledges of a river canon near Guerrero, Chi- 

 huahua ; C. G. Pringle (n. 1251), Sept. and Oct., 1887. 



Prioxosciadium Mexicanum. Stout and tall, the foliage and 

 inflorescence subpubescent : leaves ternate and compoundly pinnate 

 or pinnatifid, the ultimate segments large, oblong or lanceolate, sub- 

 crenately toothed and mostly lobed : peduncles verticillately panicled ; 

 rays 12 to 20, an inch long or less; involucels of a few linear acumi- 

 nate bracts ; pedicels very short (a line long or less) : fruit nearly 

 orbicular (a little narrower' above), retuse, cordate at base, glabrous, 

 4 to 6 lines long, the wings broader than the seed ; vittee broad and 

 nearly confluent, 3 in the intervals, 6 on the commissure. — Angelica 

 Mexicana, Vatke, Ind. Sem. h. Berol. 1876, App. 2 ? The above 

 description is drawn from Bourgeau's specimens from the valley of 

 Mexico (n. 316, in flower, and n. 571, in fruit). Vatke's species was 

 founded on specimens collected by Hahn in the valley of Mexico 

 (n. 13, in fruit) and by Ehrenberg (n. 186) at Mineral del Monte. 

 Hi3 description applies so closely to Bourgeau's specimens that the 

 identity can scarcely be doubted, though the fruit is said to be that of 

 a true Angelica and to have the intervallecular vittue solitary and 

 somewhat obscure. 



