AKALYSIS OP AM ENDOUBN. 179 



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

 "i Flowers (not on a spadix) solitary, racemed, spioate, &c" The latter is tru» 

 here. Refer to (3). 



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

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

 pupil reads : — 



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

 "* 5 Flowers dioecious, 6-androu3. Shrubby climbers." 



" * Flowers perfect." The last ia true of our specimens. Eefer to the dash ( ), 



and read, " — Gynandrous." 

 " — Monandrous." 



" — 3-6-androu3." It is 6-androus. Refer the next pupil to (6). 

 " 6 Perianth wooUy 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, thereftirs, 

 belong to the Nat. Ord. Amartllidace^. Turn to that order, and 

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



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

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

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



Lastly, Tlie "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 Bndogen (for its 

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

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

 sheaths, &c., that it is of the 156th Order, Graminese. 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 — co-iiowered (as seen in fig. 127), 

 with several perfect flowers," he refers to 9. 



Second, he determines the inflorescence to be " in panicles," and next refers to 10. 



Third, as to the awn, ho concludes that the " pale is awnless," and refers to ii. 



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

 spikelet, and all perfect ; therefore, refers to u. 



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

 specimen, viz., the "lower pale keeled, G-veined." Therefore it belongs to tlie 

 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-whoried. " 

 Pass 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 s?ujrt, irancaie liguks of this specimen prove it to 

 be Poa pratensis, or Spear Graaa 



