. Reports of explorations and surveys, to ascertain the most practicable and economical route for a railroad from the Mississippi River to the Pacific Ocean . y and perhaps not fully formed ; 15, seed of the same speciescollected in Mexico by Dr. Gregg. Cotyledons regularly incumbent. Fig. 16-19. Seeds of Op. prutescens: 16, var. longispina from the Llano Estacado (Pl. 2); 17, same from Mexico Dr. Gregg ; 18, same from Williams River branch of the greatColorado; 19, var. brevispina, from Texas, Lindheimer. In all these the cotyledons of theembryo are regularly incumbent. Fig. 20. Seeds
. Reports of explorations and surveys, to ascertain the most practicable and economical route for a railroad from the Mississippi River to the Pacific Ocean . y and perhaps not fully formed ; 15, seed of the same speciescollected in Mexico by Dr. Gregg. Cotyledons regularly incumbent. Fig. 16-19. Seeds of Op. prutescens: 16, var. longispina from the Llano Estacado (Pl. 2); 17, same from Mexico Dr. Gregg ; 18, same from Williams River branch of the greatColorado; 19, var. brevispina, from Texas, Lindheimer. In all these the cotyledons of theembryo are regularly incumbent. Fig. 20. Seeds of Op. tesselata : embryo oblique or almost accumbent. All the figures are of natural size unless the contrary is expressly stated. They were drawnwith the greatest accuracy, partly from living and in part from dried specimens, by Mr. Paulas8r 58 EXPLANATION OF THE PLATES. KoetterofSt. Louis, under the personal superintendence of Dr. Engelmann. The drawingsmade on the spot by Mr. H. B. Mollhausen, the artist of the expedition, greatly aided the workand were made use of, and even partly copied, especially in the plates exhibiting the
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