450 



ILLUSTRATIONS OP THE NATURAL ORDERS. 



wood. The leaves of Lippia citridora of the gardens yield an agree- 

 able perfume. Others are bitter and aromatic. 



875. Sabord, ? Phrymaceje (founded on Phryma, of a single species) 

 is separated on account of its simple pistil, uniovulate ovary, spirally 

 convolute cotyledons, and superior radicle. 



876. Ord. Labiata; {Labiate or Mint Family). Herbs, or some- 

 what shrubby plants, with quadi-angular stems, and opposite or 

 sometimes whorled leaves, replete with receptacles of volatile oil. 

 Flowers in axillary cymules, rarely solitary. Corolla bilabiate (Fig. 

 458). Stamens four, didynamous, or only two, one of the pairs 

 being abortive or wanting. Ovary free, deeply four-lobed ; the cen- 

 tral style proceeding from between the lobes. Fruit consisting of 

 four (or fewer) little nuts or achenia, included in the persistent 

 calyx. Seeds with little or no albumen. — Ex. The Sage, Rose- 



mary, Lavender, Thyme, Mint, &c. are familiar representatives of 

 this universally recognized order. Their well-linown cordial, aro- 

 matic, and stomachic qualities depend upon a volatile oil, contained 

 in glandular receptacles which abound in the leaves and other her- 

 baceous parts, with which a bitter principle is variously mixed. 



877. Ord. Borraginaceie {Borage Family). Herbs, or sometimes 

 shrubby plants, with round stems, and alternate rough leaves ; the 



FIG. 988. Flower of Nepeta (Glechoma) hederacea, or Ground Ivy. 989. Approximate 

 anthers of one pair of stamens, magnified. 990. Flower of a Lamium. 991. Corolla of L. 

 amplexicaule (Dead Nettle), laid open, showing the didynamous stamens, Sec. 992. Calyx and 

 corolla of Scutellaria galericulata (Skull-cap). 993. Section of the enlarged calyx of the same, 

 bringing to view the deeply four-lobed ovary. 994. Cross-section of a magnified achenium. 

 995. Vertical section of the same, showing the embryo. 996. Flower of Teucrium Canadense. 

 997. Magnified anther of the same. 998 Stamen of the Thyme. 999. Flower of Monarda. 

 1000. Magnified anther of the same. 1001. Flower of a Salvia ; the calyx as well as the corolla 

 bilabiate. 1002. Magnified stamen of the same, with widely separated anther-cells, one of 

 which (a) is polliniferous, the other (6) imperfect. 



