512 EOS ACE AE 



drooping, f ew-many-flowered : pedicels 5-10 nun. long, subtended by somewhat leafy 

 bracts: hypanthium elongated, 1.2-2 cm. long: sepals oblong-obovoid, rounded at the 

 apex, spreading or recurved: petals spatulate-obovate, 3 mm. long, eroded, erect: 

 stamens shorter than the petals, erect: filaments shorter than the anthers: berries 

 globose, smooth, 8-12 mm. in diameter, varying from yellow to black. [R. longi- 

 florum Nutt.] 



In valleys, South Dakota and Wyoming to Texas and Arizona. Cultivated and natural- 

 ized eastward. BUFFALO, GOLDEN, or MISSOURI CURRANT. 



FAMILY 10. PLATANACEAE Lindl. PLANE-TREE FAMILY. 

 Handsome trees, with a watery sap and a thin pale smooth exfoliating bark. 

 Leaves alternate: blades membranous-leathery, palmately lobed: petioles sub- 

 tended by thin, entire or toothed, sheathing stipules. Flowers monoecious, 

 minute, inserted on globose receptacles, in dense pedunculate solitary, spicate 

 or racemose heads. Perianth much reduced or wanting. Staminate heads red: 

 stamens 3-8; filaments nearly obsolete: anthers elongated, each surmounted by 

 a large connective. Pistillate heads green: carpels 2-9, 1-celled, mingled with 

 staminodia which are pilose at the apex, surrounded by long- jointed persistent 

 hairs: style terminal, stigmatose to below the middle on the ventral suture. 

 Ovules solitary or rarely 2, horizontal, orthotropous : fruit an elongated achene, 

 surrounded by rigid hairs, with a thin leathery pericarp, crowded in dense 

 globose heads. Seed pendulous, elongated, with a thin membranous testa. 

 Endosperm fleshy. Embryo straight in the axis of the endosperm. 



1. FLATANUS L. 



Trees with smooth bark and stout irregular branches from which are suspended 

 the usually numerous long-peduncled fruit-heads. PLANE-TREE. 



1. Platarms occidentalis L. A forest tree, reaching a height of 55 m., with a 

 trunk diameter of 3 m. Bark thin, pale, scaly: leaves conspicuous; blades suborbicu- 

 lar in outline, 3-5-lobed, 10-20 cm. in diameter, becoming glabrous, except the woolly- 

 pubescent nerves beneath, truncate or cordate at the base, the lobes more or less 

 prominently toothed, the teeth acuminate: petioles ^ or J as long as the blades, pale, 

 tomentose: fruiting heads globose, 2-4 cm. in diameter, solitary at the ends of, or 

 rarely spicate on slender drooping tomentose or glabrate peduncles which vary from 

 815 cm. in length. 



Along streams and in moist woods, Maine to Ontario and Nebraska, Florida and Texas. 

 Spring. BUTTON-WOOD. BUTTON-BALL. 



FAMILY 11. ROSACEAE Juss. ROSE FAMILY. 



Herbs, shrubs or trees, or rarely vines, various in habit. Leaves mostly 

 alternate : blades simple or compound : stipules often present, sometimes con- 

 spicuous. Flowers perfect, or rarely dioecious, variously disposed. Calyx of 5 

 or rarely 4-9 sepals, surmounting the more or less highly developed hypanthium, 

 often accompanied by as many scale-like bractlets. Corolla of as many distinct 

 petals as there are sepals, or wanting. Androecium of 1 or more series of sta- 

 mens. Filaments distinct. Anthers 2-celled. Gynoecium of 1 or many carpels, 

 on a depressed or elongated receptacle. Ovary 1-celled or imperfectly 2-celled. 

 Style terminal, lateral or basal. Ovules 1, 2 or several in each cavity. Fruit 

 various, mostly follicles, drupelets or achenes, these sometimes raised on a con- 

 spicuously accrescent receptacle. Endosperm wanting or rarely present. 



A. Fruit not enclosed in a depressed or hollow hypanthium. 



a. Pistils few, rarely more than 5, maturing into 2-4-seeded follicles. 



Follicles opening along both sutures: seeds shining. 1. OPULASTER, 



Follicles 9pening along one suture: seeds dull or granular. 

 * Pistils alternating with the sepals. 



