17 
107. Isoetes echinospora Braunii (Durieu) Engelm. in A. Gray, 
Man. Ed. 5, 676 (1867). 
[soetes Braun Durieu, Bull. Soc. Bot. France, 11: 101 
(1864). 
108. Isoetes echinospora Boottii Engelm. in A. Gray, Man. Ed. 5, 
676 (1867). 
109. Isoetes echinospora muricata (Durieu) Engelm. in A. Gray, 
Man. Ed. 5, 676 (1867). 
Lsoetes muricata Durieu, Bull. Soc. Bot. France, 11: roo 
(1864). 
. Isoetes echinospora robusta Engelm. Trans. St. Louis Acad. 
4: 380 (1882). 
. Isoetes Engelmanni A. Br. Flora, 29: 178 (1846). 
. Isoetes Engelmanni gracilis Engelm. in A. Gray, Man. Ed. 
5, 677 (1867). 
. Isoetes Engelmanni valida Engelm. in A. Gray, Man. Ed. 5, 
677 (1867). 
. Isoetes lacustris L. Sp. Pl. 1100 (1753). 
. Isoetes melanopoda J. Gay, Bull. Soc. Bot. France, 11: 102 
(1864). 
. Isoetes riparia Engelm. ; A. Br.-Flora, 29: 178 (1846). 
. Isoetes saccharata Engelm. in A. Gray, Man. Ed. 5, 676 
(1867). 
. Isoetes Tuckermani A. Br.; A. Gray, Man. Ed. 5, 676 (1867). 
GYMOSPERM A: " 
CONIFER. 
1. PINUS L. Sp. Pl. 1000 (1753). 
. Pinus divaricata (Ait.) Sudw. Bull. Torr. Club, 20: 44 (1893). 
Pinus sylvestris var. divaricata Ait. Hort. Kew. 3: 366 (1789). 
. Pinus Banksiana Lamb. Pinus, 1: 7, ¢. 3 (1803). 
. Pinus echinata Mill. Gard. Dict. Ed. 8, No. 12 (1768). 
- Pinus mitis Michx. Fl. Bor. Am. 2: 204 (1803). 
. Pinus palustris Mill. Gard. Dict. Ed. 8, No. 14 (1768). 
Pinus australis Michx. f. Hist. Arb. Am. 1: 64, £. Ó (1810). 
. Pinus ponderosa Dougl. Lawson's Man. 354 (1836). 
* Contributed by Professor N. L. Britton. 
