73 8 FLORA. 



long, IO-2O mm. wide; pods ascending, stem often much stouter. Tenn. to Kans., 

 Fla. and La. April-June. 



2. VlNCA L. 



Herbs, some species slightly woody, with opposite leaves, and large solitary 

 axillary flowers. Calyx 5 -parted, the segments acuminate. Corolla salverform, 

 the tube pubescent within, the lobes oblique. Stamens included. Disk of 2 glands, 

 alternate with the 2 carpels. Ovules several in each carpel; style filiform; stigma 

 annular, its apex penicillate. Follicles 2, cylindric, several-seeded. Seeds oblorig- 

 cylindric, truncate at each end. [The Latin name.] About 12 species, one native 

 of tropical Am., occurring in Fla., the others of the Old World. 



I. Vinca minor L. PERIWINKLE. MYRTLE. (I. F. f. 2894.) Perennial, 

 trailing, glabrous; stems 1.5-6 dm. long. Leaves oblong to ovate, entire, firm, 

 shining, green both sides, narrowed at the base, short-petioled, 2-6 cm. long; 

 flowers blue, 1.8-3 cm. broad; peduncles 1-4 cm. long; calyx-segments subulate- 

 lanceolate, glabrous; corolla-tube expanded above, as long as or slightly longer than 

 the obovate, nearly truncate lobes; anther-sacs with a broad connective. Escaped 

 from gardens, Ont. to Conn., N. Y. ? N. J. and Ga. Native of Europe, Feb. -May. 



3. APOCYNUM L. 



Perennial herbs, with opposite entire leaves, and small white or pink flowers in 

 _-orymbed cymes. Calyx 5 -parted, the segments acute. Corolla campanulate, the 

 tube bearing within 5 small triangular appendages alternate with the stamens, the 

 limb 5-lobed. Stamens inserted on the base of the corolla; anthers sagittate, con- 

 nivent around the stigma and slightly adherent to it. Disk 5-lobed. Ovary of 2 

 carpels; ovules numerous; stigma ovoid, obtuse, obscurely 2- lobed. Follicles slen- 

 der, elongated, terete. Seeds numerous, small, the apex tipped with a long coma. 

 [Greek, dogbane.] About 15 species, of the north temperate zone. 



Corolla 5-9 mm. long, its lobes spreading or recurved. 



Corolla not angled, pink, its tube narrowed in the throat, i. A. androsaemifolium. 

 Corolla 5-angled, white or faintly pink, its tube not narrowed in the throat. 

 Corolla campanulate, 6-7 mm. long. 2. A. medium. 



Corolla urceolate to tubular, 4-6 mm. long. 



Calyx-segments triangular-ovate, much shorter than the corolla-tube. 



3. A. Miller i. 

 Calyx-segments lanceolate, about as long as the corolla-tube. 



4. A. urceolifer. 

 Corolla 3-4.5 mm. long, its lobes erect or nearly so. 



Leaves and cymes glabrous, or somewhat pubescent. 

 Leaves petioled, mostly narrowed at the base. 



Leaves ovate-oblong to lanceolate, 2-4 times as long as wide; flowers green 



to whitish. 5. A. cannabinum. 



Leaves oblong-lanceolate, 4-6 times as long as wide; flowers white. 



6. A. album. 

 Leaves sessile or very nearly so, mostly cordate-clasping or obtuse at the base. 



7. A. hypericifolium. 

 Whole plant, including the cymes, densely soft-pubescent. 8. A. pubescens. 



1. Apocynum androsaemifolium L. SPREADING DOGBANE. HONEY- 

 BLOOM. (I. F. f. 2895.) Rootstock horizontal; stem 3-15 dm. high; branches 

 broadly spreading, mostly glabrous. Leaves ovate or oval, mucronate, glabrous 

 above, pale and usually more or less pubescent beneath, 5-10 cm. long; petioles 

 4-8 mm. long; cymes loose, usually both terminal and axillary; pedicels 4-10 mm. 

 long, subulate-bracted at the base; flowers about 8 mm. broad; calyx- segments 

 shorter than the terete tube of the pinkish corolla; corolla-lobes revolute, rounded; 

 follicles 10-17 cm. long, narrowed at the apex. In fields and thickets, Anticosti 

 to Br. Col., Ga. . Neb. and Ariz. June-July. 



2. Apocynum medium Greene. INTERMEDIATE DOGBANE. Rootstock hori- 

 zontal; stem stout, 713 dm. high, the branches ascending, glabrous. Leaves 

 oblong to oval, mucronulate, ascending, 6-9 cm. long, somewhat pubescent beneath; 

 petioles 4-8 mm. long; cymes compact, all terminal; pedicels 3-5 mm. long; flowers 

 erect; calyx-segments about half as long as the 5-angled corolla-tube; corolla white, 



