194 



POPULAR FLORA. 



ers scattered in a long and naked slender spike ; calyx greenish, 4-parted ; stamens 5 ; styles is, 

 bent down in fruit. Thickets. -P. Virghiianum. 



- ^- 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-Thumh. 



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



12. HALiiEUD-LEA\'ED K. Leaves halberd-shaped (Fig. 102), long-stalked ; akene flattish. Low 

 grounds. P. arifhlium. 



i- 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; 3 of the calyx-lobes more 

 or less winged in fruit. Thickets in low ground. P. dumetm^m. 



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

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



80. LAUREL FAMILY. Order LAURACEiE. 



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

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



9 or 1 2 on the very bot- 

 tom of the calyx ; the 

 anthers opening by up- 

 lifted valves. Pistil 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 family, most- 

 ly in hot countries, but 

 we possess two or three 

 representatives. 



484. Sterile flower oT Sftsstifras. 485. Fertile fli>we 

 witli two glands at the base , tlie antlier opeiiingby tw 

 Willi tlie ovary divided to Bliow tlie ovule banging from 

 489. Lower half of fniit, cut across. 



of the aame. 486 Magnified Btamen, 

 large and two Bmallvaives 487. Pistil, 

 tbe top. 488. Leaf and cluster of fruit. 



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



oblong leaves; common South, (Persea) Eed-Bat. 



Flowers difiecious or nearly so, greenish-yellow: stamens 9, about 8 of them with yel- 

 low glands at the base of the filaments (Fig. 4.?6). 

 Anthers 4-celIed and 4-vaIved. Tree: flowers in stalked corj'mbs, appearing with 



the leaves ; some of the latter 3-lobed, (Scissnfras) 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) SriCEmjeii 



