104 HOW PLANTS ARE CLASSIFIED AND STUDIED. 



cut." This brings you to the name of the genus, — In Latin or scientific form, 

 Caltha ; in EngUsh, Marsii-Marigold. Being the only species, Ave need go no 

 farther with it. 



825. On reflection and comparison, you will perceive the family likeness between 

 the Marsh-Marigold and the Crowfoot, different as they are in some particulars ; 

 and between these and the Globe-flower, tlie Gold-thread, the Anemony, and even 

 the Larkspur and Aconite, when you have studied these plants. But the family 

 likeness is not quite so strong at first view in this family as it is in most others. 



326. Another example we will take from the plant figured on p. 5 and the fol- 

 lowing pages (Fig. 4-19), a very common ornamental twiner about houses, flovr- 

 eting all through the summer. Begin, as before, on p. 105. You perceive at once 

 that the plant belongs to Class L ; for it has netted-veined leaves, the parts .of the 

 flower are in fives, and the embryo (which is easily extracted from the fresh seed. 

 Fig. 16-19) has a pair of seed-leaves. There is a regular pistil, and the seeds in 

 a pod ; so the plant belongs to Subclass L There is both calyx and corolla, the latter 

 of one piece ; so the plant belongs to the Monopetalous division, p. 109. The corolla 

 is borne on the receptacle below the ovary ; so you pass to the head B. The sta- 

 mens are just as many as the lobes, or rather here the plaits, of the corolla ; so you 

 pass No. 1, and take No. 2. The stamens stand before the plaits, so that they would 

 be alternate with the divisions of the corolla, if it w^ere not that the five petals it 

 consists of are united to the very top ; so you take the second of the two lines com- 

 mencing with the word " Stamens." These are " inserted on the corolla," and are 

 entirely separate and " free from the stigma " ; so you take the fourth line of those 

 in the next rank. There is a style (p. 110) ; so the plant falls under the second of 

 the two lines of the next rank. The ovary and pod have 3 cells ; so it falls under 

 the third of the lines beofinninoj with the word '^ Ovary." The stamens are 5, and 

 the pod few-seeded (2 seeds in each cell) ; so it falls under the third of the lines 

 beginning with " Stamens." The plant twines, and the seeds are large ; so }'ou are 

 brought to the name of the family, the Convolvulus Family, and are referred to 

 p. 184. Read over the marks of the family, and then search for the genus in the 

 key or arrangement ; and you will find that the name of the genus is, in scientific 

 language, Ipomcea^ in popular English, Morning-Glory. 



327. One more example, to show how plants are to be studied by the Flora, will 

 be sufficient. Take the Lily of the Valley (Fig. 3 on p. 1), which in this country 

 adorns almost every flower-garden. 



