150 Order MYRTALES 
MYRTALES. 
Terrestrial plants, or if aquatic the submerged leaves neither whorled 
nor dissected. 
Hypanthium enclosing the ovary but free from it. lL. Lytheaecess 
Hypanthium adhering to the ovary. 
Flowers usually with petals; leaves rarely cordate. 2. Onagraceze 
Flowers apetalous; leaves broader than long, cordate. 
5. Aristolochiacee. 
Aquatic plants with whorled leaves. 
Submerged leaves pinnately dissected. 3. Halorrhagidacez. 
All the leaves entire. 4. Hippuridacee. 
1. LYTHRACEZ. 
Loosestrife Family. 
Hypanthium short, about as long as wide. 
Leaves, at least the upper, clasping by a broad auricled base. 
1. Ammannia. 
Leaves not auricled, usually narrowed at the base. 
Calyx without accessory teeth in the sinuses; petals none. 
2. Didiplis. 
Calyx 4-toothed with as many accessory teeth in the sinuses; 
petals 4, small. 3. Rotala. 
Hypanthium cylindrical, much longer than wide; petals generally 6. 
4. Lythrum. 
1. Ammannia. 648. 
Flowers axillary. sessile or nearly so. 1. A. coccinea. 
Flowers in axillary cymes, pedicels 1-3 mm. long. 2. A. auriculata. 
1. Ammannia coccinea Rottb. 
Common in wet places in the southeastern part of the state. Ken- 
nedy; Lincoln; Nebraska City; Plainview; Weeping Water. 
2. Ammannia auriculata Willd. 
Rare in the southeastern part of the state. Fillmore county; Lin- 
coln. 
2. Didiplis. 648. 
1. Didiplis diandra (Nutt.) Wood. Water-purslane. 
Rare in the southeastern part of the state. Lincoln. 
3. Rotala. 649. 
1. Rotala ramosior (L.) Koehne. Tooth-cup. 
In wet places, rare. Cherry county; Lincoln. 
4. Lythrum. 649. 
1. Lythrum alatum Pursh. Loosestrife. 
Common in wet ground, especially along ponds, streams and ditches. 
Anselmo; Callaway: Endicott; Laurel; Lincoln; Mead; Nebraska 
City; New Helena; Plummer Ford: Ponca: Valentine. 
2. ONAGRACEZ. 
Evening-primrose Family. 
Calyx persistent; hypanthium not prolonged beyond the ovary. 
Leaves opposite; stems procumbent or floating. 1. Isnardia. 
