130 ANALYTICAL TABLES. 



as an expeditious method of botanical analysis. They are the result of much labor 

 and investigation, since each character employed required a previous examination 

 of all the species included under it. The process of analysis by these tables consists 

 of a simple series tf dilemmas or alternatives ; the decision being, in almost all cases, 

 to be made merely between two opposite or obviously distinct characters. These 

 (decisions or dilemmas being, moreover, few in number, conduct the student with 

 absolute precision (provided the tables be free from error, and the specimen a good 

 one) to the order or genus to which his plant belongs, by once or a few times reading 

 across the page. The advantages thus afforded will be duly appreciated, at least by 

 those who have hitherto been subjected to the drudgery of reading through whole 

 pages of dry generic descriptions, and that too, often, without arriving at any satis- 

 factory conclusion. 



In regard to the generic characters employed in the tables, it will be observed that 

 they are drawn from leaves, fruity jflower, or any portion of the plant which suited 

 our convenience, our only inquiry being after those whfch appear to us the most 

 obvious and constant. It should 'be remarked, however, that in many instances 

 these characters are not strictly applicable to all the known species belonging to 

 those particular orders or genera, but only to those which are described in this work ; 

 that is, found in the United States, north of lat. 3S|. In our choice of terms we have 

 always, of necessity, studied the utmost brevity of expression, but have used none 

 but such as are explained in the glossary or in the body of the work. 



Although the manner in which these tables are to be used will in general be ob- 

 vious at a glance, yet it may not be unprofitable to attend to the following directions 

 and illustrations. We will suppose the student to be in possession of an unknown 

 plant which he wishes to study by the aid of the Flora, in other words to analyze. 

 To this end, he first determines to which of the six great classes of the natural 'sys- 

 tem it belongs, either by his previous knowledge of their characters, which should 

 be thoroughly understood, or by an appeal to the first synoptical view, page 131. 

 Thus he inquires, 



1. Is the plant a flowering or fiowerless one ? Ans. Flowering. It belongs there- 

 fore to Pltaenogamia. Turn next to the 2d couplet. 



2. Are the leaves net-veined, &c. or parallel-veined, &c. 1 Ans. Net-veined, and 

 the flowers are not completely 3-parted ; that is, the petals, sepals and stamens may 

 be in 3 's, but the pistilis single. The plant belongs, therefore, to Exogens. Turn 

 next to the 3d couplet. 



3. Stigmas present, &c. or stigmas 0, &c. 1 Ans. Stigmas present. The plant, 

 therefore, belongs to Class I. Angiosperms. Next ascertain to which of the sub- 

 classes it belongs, by consulting the Gth triplet. 



6. Corolla with distinct petals, united petals, or wanting 1 Ans. Distinct. 

 The plant will therefore be found among the Polypetalous Exogens. Now turn to the 

 7th couplet, and inquire, 



7. Is the plant an herb, or a shrub, &Q. 1 Ans. A shrub. Turn then to couplet 

 48th. 



48. Leaves opposite, or leaves alternate 1 Ans. Alternate. Turn to 58. 

 58. Oligandrous, or polyandrous 1 Ans. Oligandrous. C3. 



63. Ovary free, <fcc. or adherent, &c. 1 Ans. Free. 64. 



64. Corolla irregular, &c. or regular 1 Ans. Regular. 05. 



65. Shrubs climbing, or erect ? Ans. Erect. 61J. 



66. Stamens how many, and how situated 1 Ann. 6, opposite to the petals. 

 The plant therefore belongs to Order VI. Berberidaceae. The pupil now turns to 

 that Order, and inquires in the conspectus, 



Is the plant an herb or a shrub 1 Ans. A shrub, and hence belongs to Genus I. 

 Berberis. Turn finally to that genus, and study the species. 



Again, suppose that, by a similar process, we had traced an unknown plant to the 

 Natural Order Ilosaceae. We should then turft to that Order (XL VIII.), and inquire, 



Ovaries free, or adherent 1 Ans. Free. 



Naked or enclosed, &o. 1 Ans. Naked. 



Are they 3 50 in number or 1 only 1 Ans. 350. 



Are they in fruit follicles, a compound berry, or achenia 1 Ans. Achenia. 



On a dry receptacle or juicy 1 Ans. Dry. 



Caudate with the persistent style or not 1 Ans. Not caudate. 



Leaves simple or compound 1 Ans. Compound. 



Is the plant caulescent or acaulescent 1 Ans. Acaulescent, and the genus is 

 Waldsteinia. Turn lastly to that genus, and learn the species. Further illustrations 

 are perhaps unnecessary. 



