310 HALORAGIDACEAE. 



1. Ludwigia microcarpa Michx. PI. Bor. Am. 1: 88. 1803. 



Perennial; glabrous; stems erect or diffuse^ simple or branched, 1-4 dm. 

 long. Leaves obovate or spatulate, entire, pinnately few-veined, 0.5-3 cm. long, 

 obtuse or apieulate at the apex, narrowed into short petioles; flowers solitary 

 and sessile in the axils; calyx-lobes triangular-ovate, about 1 mm. long; petals 

 none; capsule obpyramddal, about 2 mm. long. 



Presh-water marshes, Great Bahama : — North Carolina to Florida and Missis- 

 sippi ; Cuba ; Jamaica. Small-fkuitud Ludwigia. 



3. JUSSIAEA L. Sp. PI. 388. 1753. 



Perennial herbs, some species woody, with alternate, mostly entire leaves 

 and solitary axillary flowers, the petals usually yellow. Calyx-tube cylindrie 

 or prismatic, not prolonged beyond the ovary, the limb 4r-6-parted, its lobes 

 persistent. Petals 4-6, mostly longer than the calyx-lobes. Stamens 8-12, 

 in 2 series. Ovary 4-6-celled. Capsule narrowly cylindrie, prismatic or 

 clavate, ribbed, the pericarp deteriorating. Seeds numerous and minute. [In 

 honor of Bernard de Jussieu, 1699-1777, eminent French botanist and phy- 

 sician.] About 50' species, of tropical distribution, mostly American. Type 

 species: Jiissiaea repens L. 



1. Jussiaea suffrutic6sa L. Sp. PI. 388. 1753. 



Jussiaea angustifolia Lam. Eneycl. 3: 331. 1789. 

 Jussieua palustris Meyer, Prim. Fl. Esseq. 173. 1818. 



Erect, 6-10 dm. high, somewhat branched, more or less pubescent, at least 

 above. Leaves linear to oblong-lanceolate, entire, short-petioled, 2.5-10 cm. 

 long, acute at the apex, narrowed at the base; peduncles mostly not longer than 

 the petioles; calyx-lobes 4, rarely 5, lanceolate or ovate-lanceolate, acute or 

 acuminate, 6-12 mm. long; petals obovate, bright yellow, 2-3 times as long 

 as the calyx-lobes; capsule 3-6 cm. long, subcylindric, tapering to the base. 



Fresh-water marshes and sink-holes. Great Bahama, New Providence, Bleuthera, 

 Cat Island, Great Exuma, Acklin's Island and Crooked Island : — North Carolina to 

 Florida and Texas ; West Indies and continental tropical America ; Old World trop- 

 ics. Bushy Jussiaea. 



Family 7. HALORAGIDACEAE Kl. & Garcke. 



Water-milfoil Family. 



Perennial or rarely annual herbs, mainly aquatic, with alternate or 

 verticillate leaves, the submerged ones often pectinate-pinnatifld. Flowers 

 perfect, or monoecious, or dioecious, axillary, in interrupted spikes, solitary 

 or clustered. Calyx-tube adnate to the ovary, its limb entire or 2-4;-lob€d. 

 Petals small, 2-4, or none. Stamens 1-8. Ovary ovoid-oblong, or short- 

 eylindrie, 2-8-ribbed or winged, 1— 4-celled ; styles 1-4 ; stigmas papillose or 

 plumose. Fruit a nutlet, or drupe, compressed, angular, ribbed or winged; 

 indehiseent, of 2—4 one-seeded carpels. Endosperm fleshy; cotyledons 

 minute. Eight genera and about 100 species, of wide distribution. 



1. PEOSERPINACA L. Sp. PI. 88. 1753. 



Aquatic herbs. Leaves alternate, lanceolate, dentate or pectinate-pin- 

 natifid. Flowers perfect, axillary. Tube of the calyx adnate to the triquetrous 

 ovary, the limb 3-4-parted. Petals none. Stamens 3 or 4. Styles 3 or 4, 



