76 Rubiaceae. 



ORDER 37. — Rubiaceae. 



Calyx gamosepalous superior entire or 4 — 6-lobed. Corolla regular gamo- 

 petalous epigynous 4 — 5-lobed. Stamens 4 — 5 epipetalous. Pistil syncarpous 

 of 2 carpels. Stem 4-angled, Leaves entire whorled. Flowers minute. 

 Fruit dicoccous. 



Calyx 4-lobed, Sherardia II. 



Calyx-limb absent, 319 



319 Corolla rotate, 320 



319 Corolla campanulate, ..... Asperula III. 

 320 Corolla 5-lobed, . . . . . . ... Rubia IV. 



320 Corolla 4-lobed, . Galium I. 



I.— GALIUM. 



Calyx-limb a mere ring, corolla 4-lobed, stamens 4 alternate with the 

 petals, styles 2 short. 



Flowers yellow, 320 

 Flowers white, 321 



320 Leaves 6 or 8 in a whorl linear, ... G. verum. 

 320 Leaves 4 in a whorl ovate, . . . . G. Cruciatum. 



321 Stem with reflexed bristles, 322 

 321 Stem without reflexed bristles, 323 



322 Fruit smooth, ...... G. palustre. 



322 Fruit rough, 324 



323 Leaves 4 in a whorl, stem erect, ..... G. boreale. 

 323 Leaves 6—8 in a whorl, stem straggling, 325 



324 Fruit with hooked bristles, 326 



324 Fruit granulated, G. uliginosum. 



325 Fruit smooth, >• G. MoUugo. 



325 Fruit granulated, 327 



326 Panicles shorter than the leaves, . . , G. tricorne. 



326 Panicles longer than the leaves, ... G. Aparine. 



327 Leaves obovate, G. saxatile. 



327 Leaves linear lanceolate, G. sylvestre. 



Ga'iium tricor'ne (42). Corn Bed-straw. 6 — 10. Leaves 6 — 8 in a whorl 

 (704) lanceolate hispid, cymes axillary 3-flowered, fruit large granulated on 

 reflexed pedicels. [M. Rg. W. F. 



