234 



PRACTICAL BOTANY. 



099. Stamens (4 or 5) connected to the lobes of the 4- 



to 5-parted perianth by a tuft of hairs and inserted on a 



disk. Fruit drupaceous. Stems 8-10 inches high, very 



leafly. Comandra. 



Stamens not connected by hairs to tlie perianth. 



700 



700. Perianth 3-bracted at the base. Ovary 4-angled. 

 Stigma tufted. Stamens 4. Flowers in terminal, cylindric 

 (in fruit mucli elongated) spikes. Leaves pinnate, alternate. 



Sanguisorba Canadensis, L. 



Calyx not bracteolate at the base. (Corolla often 



present.) Ovary, or pod, short-cylindrical, or cubic. Leaves 



simple and entire, alternate, or opposite. Flowers axillary. 



(277) Ludwigia. 



701. (642.) Number of stamens the same in all flowers 

 of the species (or in some of them none) 704 



Number of stamens not the same in all flowers. 

 Stamens 9 in the sterile flowers, in 3 rows, the inner row 

 gland-bearing at the base (this sort of flowers nearly al- 

 Avays exclusively borne by one specimen of the species), and 

 either 6, or 15-18 in the fertile flowers (growing, mostly ex- 

 clusively, on another individual). Shrubs, or trees 702 



703, Leaves uniform. Fertile flowers with 15-18 rudi- 

 ments of stamens in 2 forms, and a globular ovary. Drupe 



red. Shrubs 703 



Leaves of 2 forms : one sort ovate, entire, the 

 other 3-lobed. Fertile flowers with 6 short rudiments of 

 stamens, and an ovoid ovary. Anthers 4-celled, 4-valved. 

 Drupe blue, on a red pedicel. Tree 15-50 feet high. 



Sassafras officinale, Necs. (871). 



703. Anthers 2-celled, 2-valved. Involucre of 4 scales. 

 The inner row of the 9 stamens of the sterile plant 1- to 2- 

 lobed. - Benzoin (872). 



Anthers 4-celled, 4-valved. Branchlets zigzag, 

 involucre of 2 to 4 scales. 



Tetranthera geniculata, Nees (872). 



704. L Stamens 3, rarely 9 705 



IL Stamens 6 712 



III. Stamens 12, 3 of them sterile. Perianth 6- 



