IOWA ACADEMY OF SCIENCES 
47 
Parthenocissus. 
633. P. quinquefolia (L) Planch. Abundant in woods. 
{Ampelopsis quinquefolia Michx.) 
TILIACEAE. 
Tim . 
534. T. Americana L. Abundant in woods. 
MALVACEAE. 
Malva. 
535. M. rotundifolia L. Abundant in waste places. 
Callirehoe. 
536. G. triangulata (Leaven w.) A. Gray. Rare. One colony along a 
railway right-of-way. Flowers very light for this species. 
537. C. involucrata (T. & G.) A. Gray. Rare on dry prairie. 
Abutilon. 
538. A. alyutilon (L.) Abundant in fields and waste places. 
(A. avicennae Goertn.) 
Hibiscus. 
539. H. trionum L. Plenty in fields and waste places. 
HYPEEICACEAE. 
Hypericum. 
540. H. ascyron L. Scarce along streams. 
541. H. mutilum L. Abundant in moist soil. 
CISTACEAE. 
Helianthemum. . 
542. H. majus (L.) B. S. P. Common on prairie hillsides. 
543. H. canadense (L.) Michx. Rare in sandy soil. 
Lechea. 
544. L. tenuifolia Michx. Rare in stony soil. 
VIOLACEAE. 
Viola. 
545. V. palmata L. Abundant in open woods. 
546. y. pedatifida Don. Commaon on prairies. 
547. y. pedata L. Not so common; sandy hillsides. 
548. y. oT)Uqua Hill. Common on prairies and in woods, (y. cucul- 
lata Ait. V. affmis LeConte.) 
549. y. papilionacea Pursh. Scarce in woods and meadows. 
550. y. pubescens Ait. Common in rich woods. Some forms are 
near V. scahriuscula (T. & G.) Schwein. 
TIIYMELEACEAE. 
Dieca. 
551. D. palustris L. Rare in rocky woods. 
