PASSIFLORACF-Ji. 138 MENTZELIA. 



all linear, rigid, nearly entire, or obsoletely toothed. A branching, erect or 

 decumbent [ilant, in ponds and ditches, with alternate leaves and nuracrou3 

 purplish flowers. 



10. HIPPU'RIS. 

 Calyx obsolete, entire; corolla 0; stamen 1; stigma sim- 

 ple ; seed 1, inferior. 



Gr. l-nroi, horse, ov^a, tail. Cal. a mere rim crowning the ovary. Fi!. 

 superior, short. Anth. 2-lobed, compressed. Style longer than the stamen, 

 in a groove of the anther. Seed naked. — Aquatic, perennial herbs. 



H. vulga'ris. 



Root creeping, with long, verticillate fibres; stem erect, simple, jointed; 

 ^o?<'ers axillary, sessile, solitary, often polygamous; leaves linear, acute, smooth, 

 entire, in whorls of 8 or more. An aquatic plant, from 1 to 2 feet high. Its 

 flowers are in their structure the simplest that are called perfect, consisting 

 merely of 1 stamen, 1 pistil and 1 seed, without either calyx or corolla. Fools 

 and slow waters. May. June. Per. Rare. Mare's-tail. 



ORDER LVII. LOASACE.E. 



Ca>. — Sepals nnite(l,5, persi.^tent, equal. 



Cor. — Petals 5 or U), cucullate, inserted into the recesses of the calyx. 



Sta. — Indefinite, numerous, inserted with the petals, distinct or adhering in several sets. 



Ora.— Adherent to the calyx more or less, 1-ceUed, with 3—5 parietal placentae. Style 1. 



St.'*.— Many. 



Herbaceous plants, with bristles or stinaring hairs. Leaves without stipules. Flowers 

 large. Natives of America, wust of the Mississippi. 



MENTZE'LIA. 

 Calyx tubular, 5-parted; petals 5 — 10, flat, spreading; sta- 

 mens indefinite, 30 — 200; ovary inferior; styles 3, filiform, 

 connate, and often spirally twisted; stigmas simple, minute; 

 capsule I -celled, many-seeded. 



Beautiful flowering herbs, named in honor of Dr. Christian Mentzel, phy- 

 sician to the Elector of Brandenburg. 



M. Li'NDLEYl. T. 4^ G. Bartonia aurea. Lind. 



Hispid ; leaves ovate-lanceolate, pinnatifid ; lobes often dentate ; flowers sol- 

 itary or nearly so, terminal ; petals broadly obovate, very abruptly acuminate ; 

 filaments filiform, and, with the seeds, numerous. Native of California. Stems 

 decumbent, branching, 1 — '3 feet in length, with golden yellow flowers 2 — 3 

 inches in diameter, the beauty of which is greatly heightened by the innu- 

 merable thread-like, yellow stamens. Ann. Cultivated, Golden Bartonia. 



ORDER LIX. PASSlFLORACEiE. Uc Passion Fhicer Trihe. 



Cat — Sepals 4 — 5, united below into a tube, the sides and throat of which are lined with a 



ring of fdamentous processes, which appear to be metamorphosed petals. 

 Cot. — l^elals 5, arising from the throat of the calyx outside the crovru. 



