136 PROCEEDINGS OF THE AMERICAN ACADEMY 



broad, densely uncinulate-liispid. — Ou hillsides at Las Cauoas, San 

 Luis Potosi ; October, 1890 (n. 3291). 



CoLOGANiA Jaliscana. This name is to be substituted for C. 

 Pringlei upon page 147 of the last volume of the Proceedings, on 

 account of a previous species so named in Mr. Pringle's collection of 

 1887. 



Begonia (Weilbachia) Pringlei. Rhizome slender, covered 

 with brown ovate acuminate glabrous stii^ules : petioles tomentose, 2 

 to 4 inches long ; leaves obliquely rhombic-ovate, acute, cordate at base, 

 coarsely and subsinuately toothed, sparsely pubescent above, somewhat 

 tomentose and densely papillose beneath, 2 or 3 inches long : pe- 

 duncle 4 to 8 inches high, red, slightly i)ubescent, 4-6-flowered at the 

 summit : flowers apetalous, the two sepals round-reniform or orbicu- 

 lar, 4 to 6 lines bread : fruit with two broad truncate-rounded wings, 

 the third smaller. — Ou cold ledges in Tamasopo Canon, San Luis 

 Obispo ; October, 1890 (n. 3514). 



Ertngium Mexicanum. a span high, spreading, twice branched : 

 basal leaves with a nodose petiole sheathing at base, the blade linear 

 or linear-lanceolate, sparsely serrate, usually with a pair of similar but 

 shorter lobes at base ; cauline leaves nearly sessile, similar : heads 

 pedunculate, ovate or oblong-ovate, 4 to G lines long, terminated by 

 one or sometimes two or three slender foliaceous appendages, entire 

 or occasionally cLft above, and subtended by about ten longer linear 

 acute bracts, whitish above and usually with a slender tooth on each 

 side ; bractlets none or minute : fruit covered with numerous white 

 scales, the calyx-lobes dark blue. — In wet meadows at Del Rio, State 

 of Mexico; August, 1890 (n. 3229). 



Arracacia Mariana. Stems decumbent from a branching cau- 

 dex, slender, simple or sparsely branched, a foot long, glabrous : leaves 

 near the base, thin, pinnate, the leaflets 4 or 5 pairs, an inch long or 

 often much less, acute, sharply serrate, the lower usually with a pair 

 of linear lobes at base : umbels on long terminal peduncles ; bracts of 

 tiie involucre and involucels narrowly linear; rays (6 to 10) in fruit 4 

 or 5 lines long : flowers yellow : fruit nearly sessile, ovate, acutish, 3 

 or 4 lines long, strongly and obtusely ribbed ; ventral sinus of the seed 

 completely closed. — On hillsides at Flor de Maria, State of Mexico ; 

 July, 1890 (n. 3480). 



Arracacia multifida. Tall and stout, glabrous : leaves ample 

 (a foot long or more), sessile upon a short sheathing base, ternate and 

 several times pinnate, the ultimate segments very narrowly linear, 

 entire, acute, an inch long or usually less : umbels on stout peduncles, 



