178 ANALYSIS OF AN ENDOGEN. 



" 2 Flowers acblamydeous, — with neither calyx nor corolla." — Our specimens 

 have a regular calyx. Refer to the lines marked (3). 



" Calyx tube adherent to the ovary, limb lobed or toothed. 



" Calyx free from the ovary, sometimes enclosing it." — The latter. Refer to the 

 five lines marked (4). The 3d of these lines reads, " Ovary one, 1-3-ovuled, 

 with 2-5 styles or stigmas." Our weed, having a 1-ovuled, 2-styled ovary, well 

 agrees with this description. Refer to («). 



"Fruit S-seeded, with 3 (often cleft) stigmas." 



" Fruit 1-seeded." — It is the latter, and refers us, next, to the dcsh ( — ). 



— Stipules sheathing the stem." 



— Stipules none. Calyx scarious-bracteolate." 



— Stipules none. Calyx naked. Leaves alternate." 



— Stipules none. Calyx naked. Leaves opposite." — In our specimens, the sti- 

 pules are wanting, bracteoles are wanting, and the leaves are alternate. Hence 

 they belong to Chenopodiaoejs. We turn and consult that order, as before, to 

 verify our analysis thus far, and to learn the genus. 



928. To ascertain the suborder, we must examine the embryo contained in the 

 httle shining black seed. By a good lens (or even with good eyes), we learn that 

 the embryo is not coiled, but merely bent into a ring. The leaves also, are thin (not 

 fleshy) and expanded. Hence its suborder is Cyololobeos. Refer to the starred (*) 

 lines and determine the tribe. As the inflorescence is normal (that is, of the usual 

 form, or nothing unusual), with perfect flowers and continuous (not jointed) stems, 

 we conclude that it belongs to Tribe Chenopodieae. Refer to (c). As the seed (or 

 the plane of its ring) is horizontal, the pericarp thin and the calyx not bordered wo 

 decide that its genus is CnENOPODiUM. 



The species remains now to be determined. We first read : — 

 " Plant smooth, never glandular, ill-sceuted. Embryo a complete ring." 

 " Plant glandular-puberalent, green, aromatic. Embryo half a ring." The latter 

 character applies to our plant. Read the starred (*) lines, respecting the herbage, 

 whether green or glaucous, &e. It is glaucous in Our plant, and covered with meali- 

 ness. Refer to species 5-1. Seeing, next, the italicized diagnosis, we finally de- 

 termine that the species sought is ISTo. 6. C. album ; for the leaves are rhombio-ovate, 

 Binuate-toothed, etc., etc. 



ANALYSIS OF AN ENDOGEN. 



929. A grass-like, yellow-flowered plant is now supposed to be found and fiir- 

 rtished to the pupils for analysis. Having determined that it is an Endogen (for it 

 has parallel-veined leaves and 3-parted flowers), the pupils next seek 



930. To DETERMINE ITS CLASS, whether the 3d or 4th. They read the diagnosis 

 of these clases, as follows : — ■ 



" Class 3d. Flowers with no glumes." 



" Class 4th. Flowers with greenish, alternate glumes," &c. The flowers of our 

 plant have no glumes, but a regular perianth. It is, therefore, decided to be one 

 of the PETALiFBEiE, or Class 3d. Refer to Cohorts 5 and 6, and the next pupil reads : — 



" Cohort 5. Flowers on a spadix, apetalous or incomplete." 



" Cohort 6. Flowers complete, with a, double perianth." The latter is true of 

 our plant, and it therefore belongs to the cohort of the Floride.*. Next refer the 

 pupil to {Si'), on page 197, in order 



931. To DETEMiiNE THE NATURAL Oeeee. He reads : — 



