ROSACEAE (rose FAMILY) 457 



faae of the ovate or oblong serrate leaves very woolly ; flowers in short racemes 

 crowded in a dense panicle, rose-color, rarely white ; pods woolly. — Low 

 grounds, N. B. and N. S. to the mts. of Ga., w. to Minn, and Kan. 



3. AR^NCUS [L.] Adans. Goat's Beard 



Dioecious. Carpels 3-4, splitting at the ventral suture. Flowers sessile or 

 nearly so on the long spike-like branches of a large open panicle, the fertile 

 flowers reflexed in fruit. Petals small, narrow, white. — Tall, essentially her- 

 baceous. Leaves 2-3-pinnate, the leaflets rather large, ovate-oblong. {Aruncvs, 

 a word used by Pliny to designate the beard of a goat.) 



1 . A. sylvfister Kosteletzsky . Stem erect, subsimple, bearing a few large com- 

 pound petiolate leaves and a large pyramidal spicate panicle ; leaflets 6-14 cm. 

 long, green on both sides, sharply and somewhat doubly serrate, acuminate, the 

 base mostly abrupt or subcordate, petiolulate. {Spiraea Aruncus L. ; Aruncus 

 Aruncus Karst.) — Rich soil, wooded ravines, etc., N. T. to Ga., I. T., and 

 Alaska. (Eurasia.) 



4. SORBARIA A. Br. 



Flowers perfect, paniculate. Carpels mostly 6, opposite the oalyx-lobes. 

 Leaves regularly odd-pinnate, the leaflets lance-oblong, sessile, sharply serrate. 

 (Name from Sorbus, the Mountain Ash, from the similar foliage.) 



1. S. sorbif6lia (L.) A. Br. Suffruticose ornearly herbaceous, erect; leaves 

 1-4 dm. long, 13-21-foliolate ; leaflets caudate-acuminate, with many straightish 

 mostly simple veins springing from the midnerve ; panicle ample, pyramidal, 

 terminal ; petals white. {Spiraea L.) — Common in cultivation, and escaping 

 to waste land and copses. (Asia.) 



5. GILL^NIA Moench. Indian Physio 



Calyx narrow, somewhat constricted at the throat, 5-toothed ; teeth erect. 

 Petals 5, rather unequal, linear-lanceolate, inserted in the throat of the calyx, 

 convolute in the bud. Stamens 10-20, included. Pods 5, included, at first 

 lightly cohering with each other, 2^-seed8d. — Perennial herbs, with almost 

 sessile 3-foliolate leaves ; the thin leaflets doubly serrate and incised. Flowers 

 loosely paniculate-corymbed, pale rose-color or white. (Dedicated to an obscure 

 German botanist or physician, A. Grille, or Gillenius.) Pokteeanthus Britton. 

 !/ 1. G. trifoliMa (L.) Moench. (Bowman's Root.) Leaflets ovate-oblong, 

 pointed, cut-serrate ; stipules small, awl-shaped, entire or slightly incised. — 

 Rich woods, N. Y. to Ga., Mo., and Mich. 



2. G. stipulita (Muhl.) Trel. (Amekioan Ipecac) Leaflets lanceolate, 

 deeply incised; stipules large and leaf-like, doubly incised. {Q. stipulacea 

 Nutt.; Porteranthus stipulatus Britton.) — Moist rich woods, w. N. Y. to Kan., 

 La., and Ala. 



6. PtRUS [Tourn.] L. 



Calyx-like receptacle urn-shaped, bearing 5 sepals. Petals roundish or ob- 

 ovate. Stamens numerous. Styles 2-5. Fruit a large fleshy pome, or smaller 

 and berry-like, the 2-5 cells imbedded in the flesh, papery or cartilaginous, 

 mostly 2-seeded. — Trees or shrubs, with showy flowers in corymbed or umbel- 

 like cymes. (The classical name of the Pear-tree.) A large genus, often sub- 

 divided, but with sections less strongly or constantly marked than our few species 

 would suggest. 



§1. PIR6pH0RXIM Focke. (Peak.) Leaves simple; orifice of concave re- 

 ceptacle partially or almost completely closed by a disk-like cushion ; flesh 

 of large obovoid fruit copious, containing sclerotic {gritty) cells. 



1. P. co MMfi sis L. The common Pear of cultivation. — Stray seedlings with 

 degenerate fruit ocoasionally found in eopses or woods near orchards. (Introd, 

 from Eu.) 



