THE KEY 321 



j. Stamens free from corolla but inserted with 



it : style 1 Ericaceae, p. 423 



jj. Stamens inserted on tube of corolla. 



K. Number of stamens 4 in 2 sets: ovary 



2-4-celled (cells 1 -seeded)... Verbenacex, p. 403 

 ee. Number of stamens 5 or (rarely) more. 



l. Fruit 2 or 4 nutlets. . . .Borraainacese, p. 412 

 ll. Fruit a pod, few-seeded. 



m. Calyx 5-lobed: styles 3-cleft 



Polemoniacese, p. 416 

 mm. Calyx 5-lobed: style 1 or 2, or 2-cleft: 

 ovary 2-celled (rarely 3-celled): 

 seeds good-sized, 1 or 2 per cell: 



generally twining herbs 



Convolvulacese, p. 411 

 lll. Fruit a pod, many-seeded, or a berry: 



style 1 Snlanaceas, p. 4(38 



gggo. Corolla regular or irregular: stamens fewer than 

 the corolla-lobes. 

 h. Stamens 2: ovary 4-lobed: corolla nearly 



equally 4-lobed Lycopus in Lobiatse, p. 400 



hh. Stamens 2 (rarely 3): ovary 2-celled. 



i. Woody plants, shrubs or trees: corolla regular, 



4-cleft Oleacese, p. 420 



II. Herbs: corolla wheel-shaped or salver-shaped, 

 with a 4-parted (rarely 5-parted) border, 



or somewhat irregular 



Veronica in Scrophulariaceae, p. 408 



A. CRYPTOGAMS. 



I. FILICES. Ferns. 



Herbaceous and leafy plants, ours without stems or trunks above 

 ground, but producing perennial rootstocks: plants flowerless and 

 seedless, but bearing spores in sporangia, the latter collected into 

 sori which are usually borne on the under side or margins of the fronds 

 and which are sometimes covered with an indusium. — Most abundant 

 in warm countries, of about 4,000 species, of which about 1G5 arc na1 ive 

 to the United States. The leaflets of fern-fronds are pinna'; the second- 

 ary leaflets are pinnules. 



a. Fruit borne in contracted panicles or on specially con- 

 tracted parts of the frond, these parts being devoid 

 of resemblance to green leaves. 



