2. Ovary wholly free from calyx; inflorescence axillary flowers, umbels or leafy 



racemes (3) 



3(2). Plant scapose; leaves in basal rosettes; flowers in involucrate umbels (4) 



3. Plant caulescent; leaves scattered along stems; flowers solitary in leaf axils 



or in racemes (6) 



4(3). Lobes of the corolla several times as long as the tube, sharply reflexed; 

 stamens protruding their full length 3. Dodecatheon 



4. Lobes of the corolla less than twice as long as the tube, not sharply reflexed; 



stamens usually included (5) 



5(4). Flowers numerous in open inflorescence, usually less than 5 mm. long 



4. Androsace 



5. Flowers few in a rather close inflorescence, well over 5 mm. long 



5. Primula 



6(3). Flowers sessile in the leaf axils (7) 



6. Flowers pedicellate in the leaf axils or terminal (8) 



7(6). Corolla absent; sepals petaloid; ascending perennial with mostly opposite 

 leaves; capsules valvate 6. Glaux 



7. Corolla present; minute prostrate annual with mostly alternate leaves; capsules 



circumscissile 7. Centunculus 



8(6). Leaves somewhat clasping, less than 2 cm. long; prostrate to ascending 

 annual; capsules circumscissile 8. Anagallis 



8. Leaves not noticeably clasping, well over 2 cm. long; erect or arching peren- 



nial; capsules valvate 9. Lysimachia 



1. Hottonia L. Featherfoil. Water-violet 



Two species, the Eurasian H. palustris L. and the present one in the United 

 States. 



1. Hottonia inflata Ell. American featherfoil. Fig. 606. 



Aquatic herb with the erect or ascending hollow leafless flower stems to 3 dm. 

 long, the internodes inflated; submersed stems to 5 dm. long; leaves oblong in 

 outline, to about 7 cm. long, dissected into filiform divisions, clustered at base 

 of flower stems and scattered along the rooting and floating vegetative stems; 

 flowers white, pedicellate, subtended by sepaloid bracts, several in whorls at the 

 nodes or joints to form an interrupted raceme; calyx and corolla subequal, 4-5 

 mm. long; calyx 5-parted, the divisions linear; corolla with a short tube, the limb 

 5-parted; stamens 5, included, the filaments short; capsule subglobose or obpyri- 

 form, many-seeded, the 5 valves cohering at base and summit; seeds anatropous. 



In lakes, pools and ditches in e. Tex. (Liberty, Harrison and Red River cos.) 

 and s.e. Okla. (LeFlore and McCurtain cos.), Apr .-June; from Fla. to Tex., n. to 

 N.E., N.Y., O., Ind., s. 111., Mo. and Okla. 



This species has the potential nuisance value of the water hyacinth {Eichhornia 

 crassipes) . 



2. Samolus L. Water-pimpernel. Brookweed 



Perennial somewhat succulent caulescent herbs; leaves in basal rosettes and 

 then usually alternate on stem, entire; flowers on wiry pedicels in simple or 

 panicled bracted or naked racemes; calyx herbaceous, campanulate, 5-lobed, 

 persistent; corolla perigynous, white or pink, the tube short, the 5 rounded lobes 

 imbricated; stamens 5, included, adnate to the corolla tube, sometimes alternating 

 with 5 narrow staminodia that are in the sinuses between the corolla lobes; anthers 

 cordate, erect; ovary half-inferior, 1 -celled, the stigma obtuse or capitate; ovules 



1277 



