EXPLANATION OF PLATES. 463 



PLATE 58. BiDENs Beckii (page 388). Fig. 1. disk-flower : fig. 2, outer scale of the 

 involucre ; fig. 3. inner scale : fig. 4. ray-flower : fig. 5. awn. 



59. Cacalia atriplicifolia (page 401). Fig. 1. involucre : fig. 2. flower, nat. 



size : fig. 3. flower, magnified. 



60. Arnica mollis (page 403). Fig. 1. ray-flower : fig. 2. disk-flower : fig. 3. 



hair of the pappus : all magnified. 



61. CiRsiuM ARVENSB (page 407). 



62. Lobelia siphilitica (page 424). Fig. a. calyx, magnified. 



63. Lobelia inflata (page 425). Fig. 1. transverse section of the capsule : 



fig. 2. the same, with the seeds removed, showing the placentas. 



64. Lobelia cardinalis (page 425). Fig. a. capsule, with the adhering calyx 



and withered corolla. 



65. Specularia perfoliata (page 428). Fig. 1. perfect flower ; fig. 2. the same 



with the corolla removed ; both magnified : fig. 3. corolla of one of the 

 early or imperfect flowers, showing the fine minute valvate petals closed 

 over the stamens ; fig. 4. the same laid open, exhibiting the distinct petals, 

 minute stamens, and summit of the ovary with its sessile stigma ; both 

 magnified : figs. 5., 6. & 7. capsules of the imperfect flowers, of the 

 natural size, crowned with the calyx of 3, 4 and 5 teeth. 



66. Rhododendron (Azalea) viscosum (page 439). 



67. Gaylussacia hirtella (dumosa), (page 448). Fig. 1. stamen, back view ; 



fig. 2. the same, side view : fig. 3. vertical section of the ovary and calyx : 

 fig. 4 section of the young fruit, showing the ten nucules. 



68. Chiogenes hispidula (page 450). Fig. 1. flower, nat. size : fig, 2. stamen, 



magnified ; fig. 3. the same, with the stamens and part of the corolla 

 removed, showing the disk : fig. 4. cross section of the ovary ; fig. 5. 

 longitudinal section of the same : fig. 6. fruit, nat. size ; fig. 7. the same, 

 magnified ; fig. 8. longitudinal section of the same ; fig. 9. cross section 

 of the same : fig. 10. seed : fig. II. embryo. 



69. Pyrola uliginosa (page 453). Fig. 1. stamen, side view ; fig. 2. the same, 



back view : fig. 3. pistil. 



70. Chimaphila maculata (page 455). Fig. I. stamen : fig. 2. ovary ; _^^. 3. 



cross section of the same. 



71. MoNOTROPA UNiFLORA (page 456). Fig. 1. flower, with the corolla removed: 



fig. 2. stamen, magnified : fig. 3. pistil : fig. 4. cross section of the ovary: 

 fig. 5. ripe capsule and withered stamens. 



72. Hypopithys lanuginosa, red variety (page 457). Fig. 1. capsule, natureil 



size : fig. 2. seed, greatly magnified. 



