KEY TO THE FAMILIES 289 



L. Fruit 2 or 4 nutlets 



Borraginacew, p. 381 

 LL. Fruit a pod, few seeded. 



M. Calyx 5-lobed: styles 3-cleft. 



Polemoniacew, p. 384 

 MM. Calyx 5-lobed: style 1 or 2, 

 or2-cleft: ovary 2-celled 

 (rarely 3-celled): seeds 

 good -sized, 1 or 2 per 

 cell: generally twining 

 herbs . . . Convolviilacece, p. 379 

 LLL. Fruit a pod, many-seeded, or a 



berry: style 1 ., Solan aceo', p. 377 

 jr.oG. Corolla regular or irregular: stamens fewer 

 than the corolla-lobes. 

 H. Stamens 2: oviiry 4-lobed: corolla nearly 



equally 4-lohed Lycopus in Labiahe, p. 3G9 



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



I. Woody plants, shrubs or trees: corolla 



regular, 4-eIeft Oleacece, p. 388 



II. Herbs: corolla wheel-shaped or salver- 

 sliaped, with a 4-parted (rarely 5- 

 parted) bonier, or somewhat irregu- 

 lar Veronica in Scrophulariacece , p. 370 



A. CRYPTOGAMS. 



I. FILICES. Ferns. 



Herbaceous and leafy plants, ours without stems or trunks 

 above ground, but producing perennial rootstoeks : 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 4000 species, of which 

 about 165 are native to the United States. The leaflets of feru- 

 frouds are pinnoe ; the secondary leaflets are jnnnules. 



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

 tracted parts of the frond, these parts being devoid 

 of resemblance to green leaves. 

 B. Sporangia large and globose, without a ring of special 



cells running around their margin 1. Osmunda 



S 



