36 FOUNDATIONS OF BOTANY 



X. TULIPA, Tourn. 



Stemless herbs from coated bulbs. Leaves sessile. Scape 

 simple. Flower solitary, erect. Perianth bell-shaped. Stamens 

 short, awl-shaped, with broadly linear anthers. Style short, 

 stigma thick, 3-lobed. Ovary and pod triangular. 



1. T. gesneriana, L. Common Tulip. Leaves 3-6, ovate-lanceo- 

 late, close to the ground. Flower large, on a smooth peduncle, color 

 red, yellow, white, or variegated. Cultivated from Asia Minor. 

 Many garden varieties exist. 



XI. ERYTHRONIUM, L. 



Nearly stemless herbs, arising from rather deeply buried 

 bulbs. Leaves 2, long and smooth, with underground petioles. 

 Scape arising from between the bases of the leaves. Flower 

 commonly single, nodding. 



1. E. americanum, Ker. Yellow Adder's-tongue. Leaves 

 mottled. Flowers handsome. Perianth light yellow, style club- 

 shaped, stigmas united. 



2. E. albidum, Nutt. AVhite Dog's-tooth Violet. Leaves 

 not much mottled. Perianth bluish-white. Stigmas 3, short and 

 spreading. 



Xn. SCILLA, L. 



Perennial stemless herbs from coated bulbs. Leaves linear. 

 Flowers racemed on a scape, generally blue. Divisions of the 

 perianth 1-nerved, parted almost to the base. Filaments 6, 

 often broad at the base. Style slender, with a knob-like 

 stigma. Ovary 3-angled, 3-celled. 



1. S. sibirica, Andr. Siberian Squill. Scapes 3-8 in. high, 

 several from each bulb, 2-3-flowered. Leaves 2-4, narrowly strap- 

 shaped. Flowers intense blue, short-peduncled, often nodding. 

 Cultivated from Russia and Siberia. 



Xm. CAMASSIA, Lindl. 



Stemless herbs, from coated bulbs. Leaves linear. Flowers 

 racemed, on a scape. Perianth of 6 blue or purple spreading 

 sepals. Stamens with thread-like filaments, from the base of 

 the perianth. Style thread-like, ending in a knobbed stigma. 

 Capsule 3-angled, 3-celled, several-seeded. 



