82 Introduction to Botany. 



Petals usually 4, sometimes 2-9, convolute in the bud. Stamens as 

 many or twice as many as the petals, and inserted with them on the 

 tube of the calyx. Ovary usually 4-celled; stigmas 2-4-lobed or 

 capitate. Pollen often bound together by cobwebby threads. 



I. OENOTHERA. Evening Primrose. 

 (Old name for a species oilLpilohiuni.') 



Calyx tube prolonged beyond the ovary. Petals and lobes of the 

 calyx 4. Lobes of the calyx reflexed. Stamens 8, the anthers mostly 

 versatile. Ovary elongated and 4-celled. Pollen cobwebby. Flowers 

 white, yellow, or- rose-color. 



1. (Enothera biennis, L. (L., bi, twice; annus, year.) Common Evening 

 Primrose. Erect and mostly stout annuals or biennials, i to 5 feet high, more 

 or less pubescent. Leaves lanceolate, acute, or acuminate at the apex, narrowed 

 toward the base, sessile or short-petioled, i to 6 inches long, repand-denticulate. 

 Flowers opening in the evening, bright yellow, i to 2 inches broad. Calyx tube 

 I to 2i inches long; reflexed lobes of the calyx cohering al their tips. 



2. (Enotliera speciosa, Nutt. (L., speciosus, showy.) Showy Primrose. 

 Erect or more or less decumbent perennials, from 6 inches to 3 feet high. Leaves 

 lanceolate to linear-lanceolate, sessile or short-petioled, repand-denticulate or sinuate- 

 pinnatifid, 2 to 3 inches long. Flowers usually few, I5 to 3J inches broad, white to 

 pale pink. Tube of the calyx rather longer than the ovary. Capsule strongly 

 8-ribbed. Plant pubescent. Prairies. 



3. (Enothera Missouii^nsis, Sims. Missouri Evening Primrose. Decum- 

 bent perennial with short, silken pubescence. Leaves rather thick, oval to linear 

 or oblong-lanceolate, narrowing to a slender petiole, 2 to 6 inches long, remotely 

 denticulate or entire. Flowers axillary, yellow, 3 to 6 inches broad, very striking. 

 Calyx tube -^ to 6 inches, much exceeding the ovary. Capsules very broadly 

 winged. Crests of limestone hills. 



TJMBELLIFER.ffi;. Parsley or Carrot Family. 



Herbs, mostly with hollow, ribbed stems and compound or decom- 

 pound leaves which clasp the stem at the base. Flowers small in 

 simple or compound iimbels ; in the latter case' the ultimate umbels are 

 called umbellets ; the whorl of bracts usually subtending the general 

 umbel is called the involucre, while that subtending the umbellet is 

 termed the involucel. Ovary entirely inferior, 2-celled and 2-ovuled ; 

 the limb of the calyx surmounting the ovarv either wanting or reduced 

 to a mere 5-toothed border. Styles 2 and filiform, their bases frequently 

 thickened, forming a stylopodium. Petals and stamens 5, inserted on a 



