DICOTYLEDONS. 185 



the lobes narrow, as long as the tube; follicles slender, spreading, 

 •1-6 in. long, seeds pubescent. April-June. Swamps and wet 

 ground. 



2. A. AXGUSTiFOLiA Michx. Xarrow-leaved Amsonia. The 

 whole plant villous when young, becoming smoother with age ; stems 

 finally much branched above, 2-3 ft. high ; leaves crowded, linear or 

 linear-lanceolate, fringed and revolute on the edges, almost sessile ; 

 corolla pale blue or white, funnel-form, smooth ; follicles very slen- 

 der, 2-5 in. long. April-May. On dry soil. 



II. VINCA. 



Erect or trpiling herbs ; juice only slightly milky ; leaves 

 opposite, entire, thick, smooth ; flowers axillary ; calyx tube 

 short, obconic, lobes narrow, elongated ; tube of the corolla 

 with a callous ring at the throat, pubescent within, limb 

 spreading, segments oblique ; stamens 5, alternate with the 

 lobes of the corolla, and inserted in the tube, included ; disk 

 of 2 glands alternate with the 2 carpels ; style single, stigma 

 enlarged ; follicles erect or spreading, many-seeded, seeds 

 not comose. 



V. MINOR L. Periwinkle. Stem slender, trailing, often root- 

 ing at the nodes, 1-3 ft. long; leaves ovate, acute at the apex, short- 

 petioled, bright green ; flowers axillary, solitary, 1 in. wide ; calyx 

 with linear lobes nearly as long as the inflated tube of the blue 

 corolla; matured follicles slender, slightly divergent. January-June. 

 Introduced from Europe and common in gardens. 



III. APOCYNUM. 



Perennial herbs ; stems with very tough bark, branched 

 above ; leaves opposite, entire ; flowers in terminal and axil- 

 lary bracted cymes ; calyx small, 5-parted, lobes acute ; corolla 

 bell-shaped, 5-lobed, with a small scale-like appendage at the 

 base of each lobe; stamens 5, distinct, inserted in the base 

 of the corolla tube ; ovaries 2, distinct, united by the styles, 

 stigma obtuse, 2-l()bed ; follicles long, slender, many-seeded, 

 seeds comose. 



.V. CANNAHINU.M L. IxDiAN Hemi'. Steiu «Mvct, smootli, with 

 nmnerous erect or ascending branches; Icave.s oval to oblong, niucro- 

 nate at the apex, rounded at the base, pubescent beneath, short- 



