ANALYSIS OF AN ENDOGEN. 179 



"^ Flowers (not on a spadix) in a dense, involucrate head." 

 "TT Flowers (not on a spadix) solitary, racemed, spicate, &c." The latter is tnw 

 here. Refer to (3). 



" 3 Perianth tube adherent to the ovary, wholly or partly." 

 " 3 Perianth free from the ovary." It is adherent. Refer to (*5). The next 

 pupil reads : — 



" * 5 Flowers dioecious or polygamous. Low aquatic herbs." 

 " * 5 Flowers dioecious, 6-androus. Shrubby climbers." 



" * Flowers perfect." The last is true of our specimens. Refer to the dash ( — \ 

 aad read, " — Gynandrous." 

 " — Monandrous." 



" — 3-6-androus." It is 6-androus. Refer the next pupil to (6). 

 " 6 Perianth woolly or mealy out-side." 



" 6 Perianth glabrous out-side." The latter applies to our specimens. Refer to 

 the dash ( — ). " — Stamens 3, anthers introrse." 

 " — Stamens 3, anthers extrorse." 



" — Stamens 6." The last is true of our plant. It must, therefore, 

 belong to the Nat. Ord. Amaryllidaceje. Turn to that order, and 

 932. Determine the Genus by the table, page 692, thus: 



1st. The perianth being "destitute of a crown," refers to **. 

 2d. The segments being " distinct dowu to the ovary," etc., refers to b. 

 3d. The " perianth regular," directs to the — . 



Lastly, The "sepals and petals equal," etc., indicates that our plant 

 belongs to the genus Hypoxis. 



ANALYSIS OF A GRASS. 



Having determined that this elegant and common grass is an Endogen (for its 

 leaves are parallel- veined), and that it is a member of the 7 th Cohort, the Gram- 

 inoids the pupil refers to G, and at once perceives, from its hollow culm, split 

 sheaths, &c, that it is of the 156th Order, Grammese. He turns to that Order, and 

 by the several successive steps in the table determines the genus, thus : — 



First as to the spikelets, since each one is "2 — oo-flowercd (as seen in fig. 727), 

 with several perfect flowers," he refers to 9. 



Second, he determines the inflorescence to be " in panicles," and next refers to 1©. 



Third, as to the awn, he concludes that the "pale is awnless," and refers to M. 



Then as to the glumes, he observes that there are " definitely 2" (as in fig. 7, o, a\ 

 and refers to o. 



Fifthly, as the pales are " not at all awned," he refers to s. 



Next, as to the flowers, he observes that there are several, about 4 or 5, in each 

 epikelet, and all perfect ; therefore, refers to 11. 



Seventh. Of the five lines in this set, ho selects the second as best describing his 

 specimen, viz., the "lower pale keeled, 5-veined." Therefore it belongs to tho 

 genus Poa, Then we turn to genus 40, and determine the species, thus : — 



1. As to the " branches of the panicle" they are " about in 5s, half-whorled." 

 Pas3 to b. 



2. The " spikelets" being "3 to 5-flowered, subsessile, in rather dense panicles," 

 we refer to species 13, 14. 



Lastly, the "smooth stem," and short, truncate liguks of this specimen prove it to 

 be Poa pratensis, or Spear Grass. 



