150 Ceratophyllaceae 



9. LOEFLINGIA L. 



Low much branched rather rigid and pungent-leaved 

 annuals. Leaves with adnate and connate setaceous 

 stipules. Flowers small, sessile in the axils of the leaves 

 and branches. Sepals 5, rigid, carinate. Petals minute 

 or none. Capsule 2-valved, several-seeded. 



1. L. squarrosa Nutt. Much branched, prostrate or ascend- 

 ing, 5-15 cm. high; herbage glandular-pubescent; leaves and 

 sepals subulate setaceous, rigid and recurved, the leaves 4-6 mm. 

 long, the sepals somewhat shorter; capsule elongated, triquetrous, 

 exserted, many-seeded. 



Streets of Los Angeles and Pasadena, Davidson, McClatchie. 



10. PENTACAENA Bartl. 



Tufted perennials with subulate pungent leaves and 

 silvery-hyaline stipules. Flowers sessile clustered in 

 the axils. Sepals 5, unequal, hooded, the 3 outer larger 

 and with a stout divergent terminal spine. Petals minute, 

 scale-like. Stamens 3-5, inserted at the base of the 

 sepals. Style very short, 2-cleft. Utricle enclosed in 

 the rigid persistent calyx. 



1. P. ramosissima H. & A. Stems prostrate, forming dense 

 mats 15-30 cm. broad, woolly-pubescent; leaves crowded on the 

 stems, 6 mm. long; sepals woolly, except the divergent apex; 

 utricle apiculate. 



Common in sandy soil along the coast. 



Family 30. CERATOPHYLL.ACEAE. HORNWORT 

 FAMILY. 



Submerged aquatics with slender widely branching 

 stems and verticillate leaves, the monoecious or dioecious 

 flowers solitary and sessile in the axils. Perianth many- 

 parted, the segments entire or toothed. Stamens numer- 

 ous, crowded on a flat or convex receptacle ; anthers ses- 

 sile or nearly so, linear oblong, extrorse, appendaged. 

 Ovary superior, 1-celled ; ovule 1, pendulous ; style fili- 



