ORDER CXXXVIII. ARACE-E. 549 



10, hairy. Capsules mucronate. — White. U- April — June. In wet 

 pine-barrens. Very common. 4 — 5 inches. 



5. S. pcsil la. (Mich.) Leaves linear, obtuse, short. Scape simple. 

 Flowers few ; only one usually fertile. — Muddy banks. Georgia to 

 New York. 2 — i inches. Dwarf Arrowhead. 



Genus II.— ALIS MA. L. 6—12. 

 (From the Celtic alis, water.) 



Sepals 3, persistent. Petals 3. Stamens 6. Ovaries and 

 styles numerous. Capsules numerous, in dehiscent, distinct, 1- 

 seeded. 



1. A. plaxta'go, (L.) Stem none. Leaves cordate, ovate, 9-nerved, 

 on long petioles. Scape triangular, 1 — 2 feet. Flowers in compound, 

 verticillate panicles. Fruit obtusely triangular. — White. 2£. July 

 — Aug. In the water. 1 — 2 feet. 



Genus III.— TRIGLO'CHIX. 6—3. 



Perianth 6-leaved. Stamens 3 — 4. Stigmas 3. Capsules 

 3 — 4, opening at the base. Seed solitary. 



1. T. trian'dbcm, (Mich.) Leaves terete, linear, as long as the scape, 

 erect, sheathing ; scape terete. Flowers numerous. Anthers sessile. 

 Capsules 3 — 4, united by a spongy membrane. — July to August. In 

 sands on the coast. 6 inches. 



FLOWERS INCOMPLETE, WITHOUT A PROPER PERIANTH. 



Order CXXXVIII.— ARA'CE^E. (Arum Family.) 



Flowers monoecious, arranged upon a naked spadix, or with 

 a spathe. Perianth 3-leaved, 4 — 6-parted. Stamens 3 or 6. 

 Anthers wedge-shaped. Ovary superior, 1-celled, with a soli- 

 tary, pendulous ovule. Style short. Stigmas linear, 1 or 2. 

 • indehiscent, 1-celled, 1-seeded. Leaves usually ensiform. 

 Spadix with or without a spathe. Herbaceous plants, grow- 

 ing in marshes. 



ANALYSIS. 



1. Flowers perfect 2 



Flowers moncecious 4 



1. Floating plants Pistia, 8 



Not floating plants 3 



3. Leaves lontr. narrow --; >>rus, 4 



Leaves broad Orontium, 5 



4. Floating plants Lemna, 7 



Not floating plants 5 



5. 1 _ '..alar heads Sparganium, 1 



.es Typha, 2 



6 



C. Fpadix naked at the summit Arum, 3 



Spadix covered with flowers Caladium, 6 



