AMARYLLIS FAMILY 57 



Perennial herbs, with graiss-like leaves, from a subterranean oorm or short rootstock; 

 anthers erect; flowers in ours umbellate. 2. Hypoxis. 



1. AGAVE L. American Aloe, Century Plant. i. A. utahensis. 



2. HYPOXIS L. Star-grass. i. H. Ursula. 



Family 28. IRIDACEAE. Ieis Family. 



styles alternate with the stamens; filaments more ot less united; flowers rather small; 

 sepals and petals similar. 

 Filaments united to near the top; flowers blue or white, rarely rose-purple. 



1. SISYHINCHIUM. 

 Filaments united onlj at the base; flowers rose or purple. 2. Olstnium. 



Styles opposite to and arching over the stamens, petal-like ; filaments distinct ; flowers large ; 

 sepals and petals unlike. 3. Iris. 



1. SISYRINCHIUM L. Blue-eyed Grass. 



stems bearing several peduncles from leaf-bearing nodes. 1. S. radicatum. 



Stems simple and leafless, with sessile terminal spathe (casually with a terminal leaf- 

 bearuig node and a peduncle) . 

 Outer bract of spathe little or not at all longer than the inner one, rarely surpassing 

 it by more than one-third its length. 

 Smafl and slender; flowers 10 mm. or less long; capsules less than 3 mm. high. 



2. S. halophilum. 

 Stouter; flowers 12 mm. or more long; capsules 4 mm. or more high. 



Outer bract 2-3 cm. long; flowers becoming 14 mm. long. 3. S. occidentale. 

 Outer bract 3-6 cm. long; flowers becoming 18 mm. long. 4. S. idahoense. 

 Outer bract of spathe conspicuously prolonged, sometimes 2-3 times longer than the 

 inner one. 

 Plant developing capsules among the bases of the leaves different in form from 

 those of the terminal spathes. 5. S. heterocarpum. 



No basal capsules. 



Stem winged or margined. 



Perianth-segments not emarginate. narrowed to the aristulate tip. 



Stems and leaves mostly 1-2 mm. wide; capsule obovoid-oblong, 6-7 



mm. long. 6. S. alpestre. 



Stems and leaves mostly under 1 mm. wide; capsule obovoid or sub- 

 globose, 3-5 ;nm. long. 7. S. septentrionale. 

 Perianth-segments more or less retuse or abruptly contracted to the 

 aristulate apex. 

 Stems and leaves mostly 1.5-2.5 mm. wide; capsules 4^6 mm. high. 



8. S. angustifolium. 

 Stems and leaves mostly 1.5 mm. or less in width; capsules 2—4 mm. 



high. 

 Bracts of spathe smooth ; valves of capsule veinless. 



9. S. mucronatum. 

 Bracts of spathe minutely scabrellous; valves of capsule sparsely 



venose. 10. .S. campestre. 



Stem practically marginless. 11. S. inalatum. 



2. OLSYNIUAI Raf. 1. O. grandifiorum. 

 2. IRIS L. Blub Flag, Fleur-de-lis. l. I. missouriensis. 



Family 29. ORCHIDACEAE. Orchis Family. 



Fertile stamens 2 ; lip a large Inflated sack. 



Sepals distinct ; Up with an almost conical obtiise prolongation below. 



1. Chiosanthes. 

 Lower sepals united; lip rounded-saccate. 2. Cypripedium. 



Fertile stamen 1. 



PoUinia caudate at the base, attached to a viscid disk or gland. 



Glands enclosed in a pouch-like fold; lip 3-lobed. 3. Orchis. 



Glands not enclosed in a pouch. 



Gland surrounded by a thin membrane; lip toothed at the apex. 



4. Coeloglossum. 

 Gland naked; Up entire. 



Sepals 3-5-nerved; plants with rootstock or flbro-fleshy roots. 



Stem scapiform; leaves 1-2, basal; anther-sacks divergent; plants in 

 ours with rootstocks. 

 Basal leaves 2 ; ovary straight. 5. Lysias. 



Basal leaf 1; ovary arcuate. 6. Lysiella. 



Stem leafy; anther-cells parallel or nearly so; plants with fleshy-flbrous 

 roots. 7. LIMNORCHIS. 



Sepals l-nerved; plants with rounded or oblong, undivided biennial corms. 



8. PIPEKIA. 



