132 



LESSONS IN BOTANY 



ANALYSIS OF THE NATURAL ORDERS, 



Being a Key for the ready determination of any plant, native or cultivated, 

 growing icithin any State cast of the Mississippi river, or bordering on, its 

 western shore. 



Note.— A star (*) prefixed to the name of the Order, denotes that tl\at Order, -with its 

 genera and species, is described in its place in tlie Flora. The Orders net tliu-s marked are 

 not noticed in tlic Flora beyond this Table, Tlie Orders are here nunibored lo correspond with 

 the " Class Book of Botany." 



CI. ASSES AND COHORTS 



] Floweriug rimits ... 2. Sub-Tctngdovi, I'll J^:N0GAMIA. 



1 Flowerless Plants.. ..Fevus, Mosses, Lichens, Mushrooms, 



Sea- weeds, tfcc. (not further noticed here). Sub-kijigdom, C.liYrTOGAMIA. 

 2. Leaves net-veined. Flowers never completely 3-parted ...3. EXOGENS. 



2. Leaves parallel-veined (rarely net veined). Flowers 3-parted 4. ENDOGENS. 



3. Stigmas present. Seeds inclosed in a seed-vessel 5. Angiosperms. 



3. Stigmas none. Seeds naked (Fines, Spruces, &c.). . .0. GTmnosperms. 



4. Flowers without glumes, colored or green 7. Petaliferee 



4. Flowers with green, alternate glumes, no perianth 8. Glumiferae 



5. Corolla with distinct petals A. Cohort 1. Polypetalous. 



5. Corolla with imited petals B. Cohort 2. Gamopetalous. 



5. Corolla none. Sepals sometimes none. .C. Cohorts. Apetalous. 



6. The cone-fruited plants (same asGymuospenus). .!>. Cohort 4. Conoids. 



7. Fls. on a spadix, apetalous or incomplete E. Cohort 5. Spadicifloe^. 



7. Fls. complete, perianth double. No spadix.. P. Cohorts. FLouiDEiB. 



8. The grass-like plants (same as Glumiferre). .G. Cohort 1. Graminoid» 



A Orders of the Polypetalous Exogens 



1. Herbs 2. 



L Shrubs, trees, or undershrubs. .3. 



2. Leaves alternate or all radical lo. 



2. Leaves opposite on the stem 11. 



3. Flowers regular or nearly so. . . .4. 



3. Flowers irregular (or fruit a legume, § ISO) . .57 

 4. Stamens 3 times as many as the petals, or more. . . 5. 

 4. Stamens 1 or 2 times as many as the petals, or fewer. . 7. 



5. Leaves opposite 60. 



6. Loaves alternate. . C. 



