194 



I'OPULAR FLORA. 



ers scattered in a long and naked slender spike ; calyx graenish, 4-parted ; stamens 6 ; styles 2, 

 bent down in fruit. Tiiickets. P. Virginianum. 



^-- ^_ Somewhat climbing, or supported by recurved sharp prickly bristles on the strong angles of the 

 stems, &c. ; flowers white or flesh-color in small racemes or heads; root annual. The prickly 

 angles cut like a saw, whence the plants are called Tear- Thinnb. 



11. Akkow-leaved K. Leaves arrow-shaped (Fig. 100), short-stalked; akene 3-angled. P. sagittaium. 



12. Halbekd-lea^ liD K. Leaves halberd-shaped (Fig. 102), long-stalked ; akene fiattish. Low 

 grounds. P. ai^ifoUum. 



.*- 4- H- Twining annuals, with smooth stems and greenish or whitish flowers in panicled racemes; 

 leaves heart-shaped and partly halberd-shaped. 



13. Climbing K. Smooth, climbing high over shrubs, &c. ; racemes leafy ; 8 of the calyx-lobes more 

 or less winged in fruit. Thickets in low ground. P. dumcibrum. 



14. Bindweed K. Low, stems roughish ; racemes corymbed; three of the calyx-lobes ridged in the 

 middle. Cult, and waste grounds. P. Convolvulus, 



80. LAUREL FAMILY. Order LAURACE^. 



Trees or shrubs, with spicy bark and leaves ; the latter marked with transparent dots 

 under a magnifying-glass, alternate and simple ; the calyx of 6 petal-like sepals. Stamens 



9 or 12 on the very bot- 

 tom of the calyx ; the 

 anthers opening by up- 

 lifted valves. PistiJ sim- 

 ple, with a one-celled 

 ovary, in fruit forming 

 a berry or drupe, one- 

 seeded. Flowers gener- 

 ally polygamous or dioe- 

 cious in spring. — A "very 

 well-marked famil}-, most 

 ly in hot countries, but 

 we possess two or three 

 representatives. 



^M. Sterile flower of Safisafrns. 485. Fertile fluwer of tlie name. 481 Magiiifietl Btamen, 

 witti Iwo iiirtndj at the base , the aiitlier opeiiiiiel>v two lirge and t«'[i amnllvalveB 'IS? Pistil, 

 with the ovay clivicltMl to Ehow the ovule hanging from the lop. 488. Leaf and cluster offiun. 

 489. Lower half of finjt, cut across. 



Flowers perfect : stamens 9, with good anthers, and 3 sterile ones. Tree, with entire 



oblong leaves; common South, {Persea) Eed-Bay. 



Flowers dioecious or nearly so, greenish-yellow; stamens 9, about 3 of them with yel- ~ 

 low glands at the base of the filaments (Fig. 486). 

 Anthers 4-celled and 4-valved. Tree: flowers in stalked corymbs, appearing with 



the leaves; some of the latter 3-lobed, (Sassafras) Sassafras. 



Anthers 2-celled and opening by a single valve to each cell. Shrub : flowers in ses- 

 sile clusters, appearing earlier than the entire leaves, {Benzoin) SriCEi^uSH. 



