10 



PENTANDRIA.— MONOGYNIA. 89 



'3. P. paucifiorum ; leaves sessile narrow-linear, flat : 

 spike capitate, 4-flowered ; stem slender, terete. 



HAB. Ponds and rivers. Jul} — Aug. li . Stem al- 

 most Jilif,, much branch. ; spik. on short pedunc. 



P. pectinaceum : leaves setaceous, distichously ap- 

 proximate, sheathing ; stipules almost wanting ; 

 spike few-flowered, interrupted. 



HAB. Ponds. June. U. Stem Jilif., dichot. ; /ear. 

 numerous ; 4 — 6 in. long ; pedunc. elongat. 



133. RUPPIA. Naiades. 

 11. maritima. 

 HAB. Salt marshes, ditches. July. U . Floating .• 



stem long ; leav. setae, flat ; spadix naked, 2-fl.) 



tuith. large. 



PENTANDMA. 



MONOGYNIA. 



A. Seeds naked. (Asperifoliu.) 

 * Seeds fixed to the bottom of the calyx. 



134. PULMONARIA. Cal. prismatic, pentagonal, 6 



toothed. Cor. infundibuliform ; border 5-lobed : 

 orifice naked. Seeds imperforate at the base. 



135. LITHOSPERMUM. Cal. 5-parted ; segments 



acute, carinate. Cor. infundibuliform ; border 5- 

 lobed ; orifice naked. Stem included within the 

 tube of the corolla. Stig. obtuse, bifid. Seeds 

 imperforated at the base, indurated, shining. 



136. ONOSMODIUM. Cal. deeply 5-parted; seg- 



ments linear. Cur. subcampanulate ; border ven- 

 tricose, half 6-cleft ; segments connivent, acute ; 

 orifice naked. Style much exserted. Seeds 

 ovate, shining, imperforate at the base. 

 ECH1UM. Cal. 5-parted; segments subulate 

 ere< t. Cor. subcampanulate ; tube very short ; 

 border unequally 5-lobed, the lower segment 

 acute and renexed ; orifice pervious. Stig. bifid 

 tuberculate, imperforate at the base. 

 H 2 



