10 AMERICAN MIDLAND NATURALIST 



a boon which can not be overestimated, considering the fact that 

 Pleasant Lake, N. D., is their only habitation known, now and 

 perhaps for the future. 



A. opaca was collected there by the writer on July 28 and 

 September 2, 191 2 (the type s])ecimen made up from plants of 

 the latter date.) 



3. Adicea Nieuwlandii sp. nov. 



Caulis annuus, erectus \el ascencens, simplex, glaber, pellu- 

 cidus, supra dimidiam partem foliosus. F'olia geminorum 5-7. 

 Succulenta (siccata membranacea), 2-4 cm. longa, 1-2.5 cm. 

 lata, ovata, nonnihil acuminata, dentibus 4-7 crasse crenato- 

 serrata, basi rotundata vel cuneata, 3-nervata, exigue et appresse 

 pilosa vel glabrata, petiolis omnibus lamina brevioribus. Florum 

 cymi 5-6, in axillis foliorum brevi-pedunculati. Achaenia 1.5 

 mm. longa, '^-1% mm. lata, sive aequaliter viridia sive punctis 

 obscurius viridibus marginaliter vestita. 



Stem annual, erect or ascending, simple, glabrous, pellucid, 

 leafy above the middle. Leaves 5-7 pairs, watery (after 

 drying membranous), 2-4 cm. long, 1-2.5 cm. wide (the lowest, 

 especially if there is some rudimentary branching, very small, 

 I cm. long or less), ovate, somewhat acuminate, coarsely crenate- 

 serrate with 4-7 teeth, rounded or cuneate at base, 3-nerved, with 

 the lateral nerves ending in the 2nd tooth, appressedly short- 

 hairy or glabrate, petioles all shorter than the laminae. Flower 

 clusters 5-6 in the leaf-axils, short-peduncled. Achenes 1.5 mm. 

 long, ^-ij4 mm. wide, either uniformly green or with a dotted 

 darker green lining along the margin. While the size of the achene 

 is almost invariably constant in the other species here described, 

 its width in this species is quite variable. 



The late date of its collection (October 19, 191 2) surely 

 quaranteed a ripe specimen. It was collected at Notre Dame, 

 Indiana, by Prof. J. A. Nieuwland and was named in his honor. 



4. Adicea Deamii sp. nov. 



Caulis annuus, ramos diffusos vel aequatos etiam propemodum 

 de basi emittens, vel simplex, adscendcns vel paene erectus, 30-40 

 cm. altus, succulentus, glabratus, pellucidus. Folia gemina 

 7-10, opposita, succulenta (siccata membranacea), 2-9 cm. 

 longa, 1.5-4 cm. lata (ramorum 2-4 cm. longa, 1-2 cm. lata), 

 ovata, brevi-acuminata, dentibus 6-12 crasse crenato-serrata, basi 



