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 of 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, fruit, flower, or any portion of the plant which suited 
our convenience, — our only inquiry being after those which appear to us the most 
obvious and constant. It should be remarked, however, that in many instances 
these characters are not strictly applicable to al7 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. 383°. 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 
lant which he wishes to study by the aid of the Flora, in other words to analyze. 
o 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 130. 
Thus he inquires, — 
1. Is the plant a flowering or flowerless one? Ans. Flowering. It belongs there- 
fore to Phenogamia. Turn next to the 2d couplet. 
2. Are the leaves net-veined, &c. or parallel-veined, &c. Ans. Net-veined, and 
the flowers are not wholly trimerous; that is, the petals, sepals, and stamens, are in 
in threes, but the carpels are single. The plant belongs, therefore, to Exogens. 
Turn to the 3d couplet. 
3. Stigmas present, &c. or stigmas 0, &c. Ams. Stigmas present. The plant 
therefore belongs to Class I. Angiospermous Exogens, Next ascertain to which of 
the sub-classes it belongs, by synopsis 2d. 3 4 
4, Are the petals distinct, or united, or 0, &c.? Ams. Distinct. The plant will 
be found therefore among the Polypetalous Exogens. Now turn to the Conspectus 
of the Orders of this subdivision, and inquire, — 
7. Is the plant an herb or a shrub? Avs. A shrub. Turn then to couplet 54. 
54. Leaves opposite, or leaves alternate ? Ams. Alternate. Turn to 65. 
65. Stipules present, cr stipules none? Ams. Stipules none. 70. 
70. Flowers ¢ 9, or 5 ? Ans, 8. Turn then to couplet 72. 
72. Stamens (00) indefinite, or 6, or 4, or 5? Ams. 6; and the plant belongs there- 
fore to the natural order Berberidacez. The pupil now turns to Order VI. and 
sys, ge in the Conspectus, — 
the plant an herb orashrub? Azs. A shrub, and therefore belongs to Berberis, 
genus Ist. Turn finally to that genus, and study the species. ; 
Again, suppose the plant to be an herb. Turn to couplet 8. 
8. Leaves alternate, &c. or opposite? Ams. All radical. 9. 
9. Stipules present or0? Avs. Present (radical). 34. : 
34. Flowers regular or irregular? Ans. Regular. 35. 
35. Stamens monadelphous or distinct? Ams. Distinct, and the order sought is 
Rosacee. Then turn to Order XLVIII. and inquire, — 
Ovaries free or adherent ? Avs. Free. 
Naked or enclosed, &c. ? Ans. Naked. 
Are they 3—50 in number or 1 only? Ans. 3—50. 
Are they in fruit follicles, 2 compound berry, or achenia? Ans. Achenia. 
On a dry receptacle or juicy ? Ams. Dry. 
Caudate with the persistent style or not? Ams. Not caudate. 
Leaves simple or compound ? Ams. Compound. . 
__Is the plant caulescent or acaulescent? Ams. Acaulescent, and the genus is 
Waldsteinia. Turn lastly to that genus, and learn the species. Further illustrations 
are perhaps unnecessary. ‘ 
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