Family HALORRHAGIDACEE 155 
3. HALORRHAGIDACEZ. 
Water-milfoil Family. 
1. Myriophyllum. 665. 
Floral leaves small, usually shorter than the flowers; fruit smooth 
or nearly so. 1. M. spicatum. 
Floral leaves large, 5-12 mm. long, much longer than the flowers; 
fruit rough. 2. M. pinnatum. 
1. Myriophylium spicatum L. Spiked Water-milfoil. 
In water in various localities. Kearney; Long Pine; Whitman; 
Wood Lake. 
2. Myriophyllum pinnatum (Walt.) B. S. P. 
Lincoln. 
4, HIPPURIDACEZ. 
1. Hippuris. 665. 
1. Hippuris vulgaris L. Mare’s-tail. 
In swamps 25 miles south of Whitman. 
5. ARISTOLOCHIACE. 
1. Asarum. 348. 
1. Asarum reflexum Bicknell. Wild Ginger. 
In northeastern Kansas and probably in southeastern Nebraska. 
CACTALES. 
1, CACTACE. 
Cactus Family. 
Stems globose or ovoid, tubercled, not jointed. 1. Cactus. 
Stems jointed, the joints flattened or cylindrical, not tubercled. 
2. Opuntia. 
1. Cactus (Coryphantha). 644. 
Tubercles with 10-20 gray spines; berry 6-8 mm. in diameter. 
1. C. missouriensis. 
Tubercles with 3-8 reddish-brown spines surrounded by grayish ones; 
berry 12-18 mm. in diameter. 2. C. viviparus. 
1. Cactus missouriensis (Sweet) Kuntze. Nipple Cactus. 
Valentine. 
2. Cactus viviparus Nutt. Purple Cactus. 
In dry soil in the northwestern part of the state. Alliance; Cherry 
county; Kearney; Sheridan county; Valentine. 
2. Opuntia. 644. 
Internodes of stem decidedly flattened, 5-20 cm. long. 
Flowers yellow. 
Pulvini 18-35 mm. apart, 1-5 spined or spines wanting; fruit 
pulpy, unarmed or nearly so. 
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