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LESSONS IN BOTANY 



ANALYSIS OF THE NATURAL ORDERS, 



Being a Key for the ready determination of tJie Natural Order of any plani, 

 native or cultivated^ growing within any State east of the Mississippi river^ 

 or bordering on its loestern share. 



X7oTE. — A star (*) prefixed to the name of tbe Order, aenotea tbal that Order, with its 

 ^t,-jera and species, is described in its jilace in the Flora. The Orders not thns marked aro 

 not noticed in the Flora beyond this Table. The Orders are here numbered to correspond with 

 the "Class Book of Botany." 



Cl.ASSES AND COHORTS 



1 Floweriug Plants ... 2. Sub-Tcingdorn, 1'HiENOGAM.IA. 



1 Flowerless Plants Ferns, Mosses, Lichens, Mushrooms, 



Sea-weeds, &c. (not further noticed here). Sub-kingdom^ CKYPTOGAMIA. 

 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 m a seed-vessel 5. Angiosperms, 



3. Stigmas none. Seeds naked (Pines, Spruces, &c.). . .0. Gymnosperms. 



4 Flowei-s without glumes, colored or green 7. Petalifer^ 



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



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



5. Corolla with united petals B. Cohort 2. Gamopetalous, 



5. Corolla none. Sepals sometimes none. .C. Cohort 2,, Apetalous. 



6. The cone-fruited plants (same as Gymnosperms). .D. Cohort 4. Conoids. 



7. Fls. on a spadix, apetalous or hicomplete E. Cohort 5. Spadiciflor^. 



7. Fls. complete, perianth double. No spadix. .P. Cohort 6. Floridea 



8. The grass-like plants (same as Glumiferje). XSt. Cohort 7. Graminoid* 



A Orders of the Polypetalous Exogens 



1. Herbs.... 2. 



1. Shrubs, trees, or undershrubs. .3. 

 Loaves alternate or all radical. . . .15. 

 Leaves opposite on the stem 11. 



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



3. Flowers irregular (or fruit a legume, § 180) . .57 

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

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



6. Leaves opposite .... 60. 



5. Leaves alternate. . fi. 



