PEA FAMILY 123 



small, nearly enclosed in the calyx, indehiscent, 1 — 4-seeded. 

 (Name from the Latin tri, three, and. folium, a leaf.) * 



* Heads few-flozvered, axillary : throat of calyx naked 



1. T. subterrdneum (Subterranean Clover). — A curious little 

 plant, with prostrate, branched, hairy stems ; and small axillary 

 heads of white flowers, 3 — 5 together, with numerous 5 -toothed 

 abortive calyces which cover the pods, as the head bends abruptly 

 downwards after flowering, burying itself in the ground. — Dry 

 sandy places ; uncommon. — Fl. May, June. Annual. 



** Heads many-flowered, terminal : throat of calyx with a 



ring of hairs : pod i-seeded 



f Heads ovoid or globose 



2. T. pratense (Red Clover). — Leaflets broad, notched or 

 entire ; stipules broad, terminating abruptly in a long bristle ; 



flowers red, or sometimes white, in terminal, sessile, dense 

 roundish-oblong heads : calyx hairy, its bristle-like teeth half as 

 long as the corolla. — -The common clover of meadows, where it 

 forms a valuable part of the hay crop. There are also improved 

 cultivated varieties. The corolla tubes abound in honey, on 

 which account children often call them Honeysuckles. The 

 flowers are very sweetly-scented. — Fl. all the summer. Perennial. 



3. T. medium (Zigzag Clover). — Not unlike the last, but dis- 

 tinguished by its more slender, erect, zigzag habit; narrower, 

 elliptical, slightly hairy leaflets ; lanceolate, not abrupt, stipules ; 

 and loose, stalked, round heads of flowers. — Dry pastures and 

 bushy places ; common. It thrives better than T. pratense in 

 dry soils. — Fl. June — September. Perennial. 



4. T. ochroMcon (Sulphur-coloured Trefoil). — Erect, 6 — 18 in. 

 high, downy ; lower leaves on very long stalks ; flowers cream- 

 coloured, turning brown as they fade, in terminal, stalked, dense 

 heads, which are at first globose, afterwards ovate. — Dry pastures 

 in the eastern counties ; rare. — Fl. June — August. Perennial. 



5. T. squamosum (Teazle-headed Trefoil). — Stem spreading, 

 usually procumbent ; stipules awl-shaped, very long ; flozvers 

 small, pink, in terminal, stalked, roundish head ; calyx-teeth 

 awl-shaped, ciliate, shorter than the corolla, finally becoming 

 enlarged, broad and spreading. — Salt marshes in the south of 

 England. — Fl. June, July. Annual. 4 



ft Heads cylindric, during or after flowering 

 6.* T. incarndtum (Crimson Clover). — Erect, downy, with 

 spreading hairs ; leaflets obovate ; stipules ovate, blunt ; flowers 



