24 MIDDLESEX FLOKA. 



T. HYBRIDUM, L. ALSYKE. 



This plant, occasional throughout the county, has within a few 

 years become thoroughly established in the eastern and southern 

 sections. June-Aug. Nat. from Eu. 



"Heads roundish, dense; peduncles axillary, twice the length of 

 the leaves ; pedicels deflexed after flowering, the inner twice or 

 thrice the length of the calyx tube ; calyx smooth with naked 

 throat, half the length of the corolla, with subulate teeth, the two 

 upper longer; stems ascending, very smooth, hollow; stipules 

 ovate, attenuate to a very acute point ; leaves rhomboidal-elliptic, 

 obtuse, serrulate. Lower leaves obovate; flowers white to rose- 

 color." Koch, Syn. Fl. Germ. 



T. REPENS, L. WHITE CLOVER. 



Very common. Possibly indigenous, but probably introduced 

 from Eu. May-Sept. 



T. AGRARIUM, L. YELLOW OR HOP-CLOVER. 



Widely distributed, but not very common. June-Aug. Nat. from Eu. 



T. PROCUMBENS, L. LOW HOP-CLOVER. 



Medford, Groton, et al. Not so common as the preceding. July. 

 Nat. from Eu. Form known as var. MINUS, Koch, occasional. 



T. Dalmaticum, Vis. 



Lowell, "dump" (Dr. C. W. Swan). Adv. from Eu. 

 "Heads terminal and axillary, the axillary sessile or nearly so; 

 calyx naked at the base ; stipules dilated, at least the upper ; calyx 

 teeth not longer than the tube ; calyx sulcate in fruiting ; flowers 

 red ; stems decumbent, with appressed hairs." Cesati, Passerini 

 and Gibelli, Flora Italiana. 



T. Macraei, Hook and Arn. 



Wool-waste, N. Chelmsford (Rev. W. P. Alcott). Adv. from Cal. 

 "Somewhat villous, with appressed or spreading hairs, erect, 

 slender, a half to a foot high ; stipules ovate to lanceolate ; leaflets 

 obovate to narrowly oblong, obtuse or retuse, serrulate, about half 

 an inch long ; flowers dark purple, 3 lines long, in dense ovate long- 

 peduncled heads, calyx very villous ; the straight teeth as long as 

 the petals, often tinged with purple ; pod 1-seeded." Bot. Cal. 



MELILOTUS, Tourn. 



M. parviflora, Desf . 



Lowell, "dumps;" Westford, woollen-mill yards (Dr. C. W. 

 Swan). 



"Annual, smooth, erect, often 2 or 3 feet high, branching; leaflets 

 mostly cuneate-oblong, obtuse, denticulate, an inch long or less ; 



